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127-437: The ZEUS detector comprised many different detector components, including a depleted uranium plastic- scintillator calorimeter , a central tracking detector (which was a wire chamber ), a silicon microvertex detector and muon chambers . In addition, a solenoid provided a 1.43  T magnetic field . The ZEUS detector measured 12 m × 11 m × 20 m and weighed 3600 tons. Like its partner experiment H1 ,

254-452: A compensating calorimeter the response ( e ) for an electromagnetic cascade is equal to the response ( h ) for a hadronic cascade of the same energy (i.e. e / h = 1 ). In the ZEUS calorimeter neutral pions interacted with uranium atoms to produce slow-moving neutrons which were captured by the scintillator and increased the hadronic signal. Another advantage of using uranium as the absorber

381-511: A core made using depleted uranium, later changed to tungsten . Another use of depleted uranium is in kinetic energy penetrators , anti-armor rounds such as the 120 mm sabot rounds fired from the British Challenger 1 , Challenger 2 , M1A1 and M1A2 Abrams. Kinetic energy penetrator rounds consist of a long, relatively thin penetrator surrounded by a discarding sabot. Staballoys are metal alloys of depleted uranium with

508-598: A debate in 2009 about the effects of the use of armaments and ammunitions containing depleted uranium. All other European Union nations voted in favour or abstained. The ambassador from the Netherlands explained his negative vote as being due to the reference in the preamble to the resolution "to potential harmful effects of the use of depleted uranium munitions on human health and the environment [which] cannot, in our view, be supported by conclusive scientific studies conducted by relevant international organizations." None of

635-528: A description of this process of reactor control). As little as 15 lb (6.8 kg) of uranium-235 can be used to make an atomic bomb. The nuclear weapon detonated over Hiroshima , called Little Boy , relied on uranium fission. However, the first nuclear bomb (the Gadget used at Trinity ) and the bomb that was detonated over Nagasaki ( Fat Man ) were both plutonium bombs. Uranium metal has three allotropic forms: The major application of uranium in

762-479: A distribution of uranium oxidation species in various forms ranging from most oxidized to least oxidized. Particles with short residence times in a calciner will generally be less oxidized than those with long retention times or particles recovered in the stack scrubber. Uranium content is usually referenced to U 3 O 8 , which dates to the days of the Manhattan Project when U 3 O 8

889-539: A few parts per million in soil, rock and water, and is commercially extracted from uranium-bearing minerals such as uraninite . Many contemporary uses of uranium exploit its unique nuclear properties. Uranium-235 is the only naturally occurring fissile isotope , which makes it widely used in nuclear power plants and nuclear weapons . However, because of the low abundance of uranium-235 in natural uranium (which is, overwhelmingly, mostly uranium-238), uranium needs to undergo enrichment so that enough uranium-235

1016-566: A form of invisible light or rays emitted by uranium had exposed the plate. During World War I when the Central Powers suffered a shortage of molybdenum to make artillery gun barrels and high speed tool steels, they routinely used ferrouranium alloy as a substitute, as it presents many of the same physical characteristics as molybdenum. When this practice became known in 1916 the US government requested several prominent universities to research

1143-741: A fuel in the nuclear power industry and in Little Boy , the first nuclear weapon used in war . An ensuing arms race during the Cold War between the United States and the Soviet Union produced tens of thousands of nuclear weapons that used uranium metal and uranium-derived plutonium-239 . Dismantling of these weapons and related nuclear facilities is carried out within various nuclear disarmament programs and costs billions of dollars. Weapon-grade uranium obtained from nuclear weapons

1270-690: A higher incidence of cancer . An excess risk of lung cancer among Navajo uranium miners, for example, has been documented and linked to their occupation. The Radiation Exposure Compensation Act , a 1990 law in the US, required $ 100,000 in "compassion payments" to uranium miners diagnosed with cancer or other respiratory ailments. During the Cold War between the Soviet Union and the United States, huge stockpiles of uranium were amassed and tens of thousands of nuclear weapons were created using enriched uranium and plutonium made from uranium. After

1397-473: A higher-than-natural concentration of lower- mass-number uranium isotopes (in particular U, which is the uranium isotope supporting the fission chain reaction ) with the bulk of the feed ending up as depleted uranium. Natural uranium metal contains about 0.71% U, 99.28% U, and about 0.0054% U. The production of enriched uranium using isotope separation creates depleted uranium containing only 0.2% to 0.4% U. Because natural uranium begins with such

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1524-497: A lesser degree uranium-233, have a much higher fission cross-section for slow neutrons. In sufficient concentration, these isotopes maintain a sustained nuclear chain reaction . This generates the heat in nuclear power reactors and produces the fissile material for nuclear weapons. The primary civilian use for uranium harnesses the heat energy to produce electricity. Depleted uranium ( U) is used in kinetic energy penetrators and armor plating . The 1789 discovery of uranium in

1651-543: A low percentage of U, enrichment produces large quantities of depleted uranium. For example, producing 1 kilogram (2.2 lb) of 5% enriched uranium requires 11.8 kilograms (26 lb) of natural uranium, and leaves about 10.8 kilograms (24 lb) of depleted uranium having only 0.3% U. Depleted uranium is further produced by recycling spent nuclear fuel , in which case it contains traces of neptunium and plutonium . These quantities are so small that they are not considered to be of serious radiological significance by

1778-404: A much longer half-life than the lighter isotopes, DU is about 40% less radioactive than natural uranium. Most of the alpha radiation comes from U and U whereas beta radiation comes from decay products Th and Pa that are formed within a few weeks. The United States Nuclear Regulatory Commission (NRC) defines depleted uranium as uranium with a percentage of the U isotope that

1905-448: A much more complicated and far more powerful type of fission/fusion bomb ( thermonuclear weapon ) was built, that uses a plutonium-based device to cause a mixture of tritium and deuterium to undergo nuclear fusion . Such bombs are jacketed in a non-fissile (unenriched) uranium case, and they derive more than half their power from the fission of this material by fast neutrons from the nuclear fusion process. The main use of uranium in

2032-438: A nature to cause superfluous injury or unnecessary suffering and urged all states to curb the production and the spread of such weapons. Included in the list was weaponry containing depleted uranium. The committee authorized a working paper, in the context of human rights and humanitarian norms, of the weapons. The requested UN working paper was delivered in 2002 by Y. K. J. Yeung Sik Yuen in accordance with Sub-Commission on

2159-459: A plutonium-based device (see Trinity test and " Fat Man ") whose plutonium was derived from uranium-238. Little Boy became the first nuclear weapon used in war when it was detonated over Hiroshima , Japan , on 6 August 1945. Exploding with a yield equivalent to 12,500 tonnes of TNT , the blast and thermal wave of the bomb destroyed nearly 50,000 buildings and killed about 75,000 people (see Atomic bombings of Hiroshima and Nagasaki ). Initially it

2286-405: A reaction by piling together 360 tonnes of graphite , 53 tonnes of uranium oxide , and 5.5 tonnes of uranium metal, most of which was supplied by Westinghouse Lamp Plant in a makeshift production process. Two types of atomic bomb were developed by the United States during World War II : a uranium-based device (codenamed " Little Boy ") whose fissile material was highly enriched uranium , and

2413-413: A shielding material. Due to its high density, this material is found in inertial guidance systems and in gyroscopic compasses . Depleted uranium is preferred over similarly dense metals due to its ability to be easily machined and cast as well as its relatively low cost. The main risk of exposure to depleted uranium is chemical poisoning by uranium oxide rather than radioactivity (uranium being only

2540-525: A shorter half-life and so is an extinct radionuclide , having long since decayed completely to Th. Further uranium-236 was produced by the decay of Pu , accounting for the observed higher-than-expected abundance of thorium and lower-than-expected abundance of uranium. While the natural abundance of uranium has been supplemented by the decay of extinct Pu (half-life 375,000 years) and Cm (half-life 16 million years), producing U and U respectively, this occurred to an almost negligible extent due to

2667-462: A three-week period of conflict in Iraq during 2003, it was estimated that between 1,000 and 2,000 tonnes of depleted uranium munitions were used. More than 300,000 DU rounds were fired during the 2003 war, the vast majority by US troops. The International Atomic Energy Agency (IAEA) estimates that between 170 and 1,700 tonnes of depleted uranium was dropped in Iraq by the US military since 2003, whereas

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2794-541: A unanimous parliamentary vote on the issue on 22 March 2007. The text of the 2007 law allowed for two years to pass until it came into force. In April 2009, the Belgian Senate voted unanimously to restrict investments by Belgian banks into the manufacturers of depleted uranium weapons. In September 2009, the Latin American Parliament passed a resolution calling for a regional moratorium on

2921-412: A very small proportion of other metals, usually titanium or molybdenum . One formulation has a composition of 99.25% by mass of depleted uranium and 0.75% by mass of titanium . Staballoys are approximately 1.67 times as dense as lead and are designed for use in kinetic energy penetrator armor-piercing ammunition. The US Army uses DU in an alloy with around 3.5% titanium. Depleted uranium is favored for

3048-412: A weak alpha emitter ). During the later stages of World War II , the entire Cold War , and to a lesser extent afterwards, uranium-235 has been used as the fissile explosive material to produce nuclear weapons. Initially, two major types of fission bombs were built: a relatively simple device that uses uranium-235 and a more complicated mechanism that uses plutonium-239 derived from uranium-238. Later,

3175-535: A world total production of 48,332 tonnes. Most uranium was produced not by conventional underground mining of ores (29% of production), but by in situ leaching (66%). In the late 1960s, UN geologists discovered major uranium deposits and other rare mineral reserves in Somalia . The find was the largest of its kind, with industry experts estimating the deposits at over 25% of the world's then known uranium reserves of 800,000 tons. The ultimate available supply

3302-552: Is malleable , ductile , slightly paramagnetic , strongly electropositive and a poor electrical conductor . Uranium metal has a very high density of 19.1 g/cm , denser than lead (11.3 g/cm ), but slightly less dense than tungsten and gold (19.3 g/cm ). Uranium metal reacts with almost all non-metallic elements (except noble gases ) and their compounds , with reactivity increasing with temperature. Hydrochloric and nitric acids dissolve uranium, but non-oxidizing acids other than hydrochloric acid attack

3429-523: Is a naturally occurring element found in low levels in all rock, soil, and water. It is the highest-numbered element found naturally in significant quantities on Earth and is almost always found combined with other elements. Uranium is the 48th most abundant element in the Earth’s crust. The decay of uranium, thorium , and potassium-40 in Earth's mantle is thought to be the main source of heat that keeps

3556-419: Is also a matter of concern. Depleted uranium is very dense; at 19,050 kg/m , it is 1.67 times as dense as lead , only slightly less dense than tungsten and gold , and only 16% less than osmium or iridium , which are the densest known substances under standard (i.e., Earth-surface) pressures. Consequently, a DU projectile of given mass has a smaller diameter than an equivalent lead projectile with

3683-530: Is also fissile by thermal neutrons. These discoveries led numerous countries to begin working on the development of nuclear weapons and nuclear power . Despite fission having been discovered in Germany, the Uranverein ("uranium club") Germany's wartime project to research nuclear power and/or weapons was hampered by limited resources, infighting, the exile or non-involvement of several prominent scientists in

3810-520: Is believed to be sufficient for at least the next 85 years, though some studies indicate underinvestment in the late twentieth century may produce supply problems in the 21st century. Uranium deposits seem to be log-normal distributed. There is a 300-fold increase in the amount of uranium recoverable for each tenfold decrease in ore grade. In other words, there is little high grade ore and proportionately much more low grade ore available. Calcined uranium yellowcake, as produced in many large mills, contains

3937-556: Is considered sufficiently "hot" and dangerous to warrant these protections. But since weapons containing DU are relatively new weapons no treaty exists yet to regulate, limit or prohibit its use. The legality or illegality of DU weapons must therefore be tested by recourse to the general rules governing the use of weapons under humanitarian and human rights law which have already been analysed in Part I of this paper, and more particularly at paragraph 35 which states that parties to Protocol I to

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4064-501: Is controversial because of concerns about potential long-term health effects. Normal functioning of the kidney , brain , liver , heart , and numerous other systems can be affected by exposure to uranium, a toxic metal . It is only weakly radioactive because of the long radioactive half-life of U (4.468 × 10 or 4,468,000,000 years) and the low amounts of U (half-life about 246,000 years) and U (half-life 700 million years). The biological half-life (the average time it takes for

4191-785: Is difficult to precipitate uranium as phosphate in the presence of excess carbonate at alkaline pH. A Sphingomonas sp. strain BSAR-1 has been found to express a high activity alkaline phosphatase (PhoK) that has been applied for bioprecipitation of uranium as uranyl phosphate species from alkaline solutions. The precipitation ability was enhanced by overexpressing PhoK protein in E. coli . Plants absorb some uranium from soil. Dry weight concentrations of uranium in plants range from 5 to 60 parts per billion, and ash from burnt wood can have concentrations up to 4 parts per million. Dry weight concentrations of uranium in food plants are typically lower with one to two micrograms per day ingested through

4318-418: Is diluted with uranium-238 and reused as fuel for nuclear reactors. Spent nuclear fuel forms radioactive waste , which mostly consists of uranium-238 and poses a significant health threat and environmental impact . Uranium is a silvery white, weakly radioactive metal . It has a Mohs hardness of 6, sufficient to scratch glass and roughly equal to that of titanium , rhodium , manganese and niobium . It

4445-485: Is found in hundreds of minerals, including uraninite (the most common uranium ore ), carnotite , autunite , uranophane , torbernite , and coffinite . Significant concentrations of uranium occur in some substances such as phosphate rock deposits, and minerals such as lignite , and monazite sands in uranium-rich ores (it is recovered commercially from sources with as little as 0.1% uranium ). Like all elements with atomic weights higher than that of iron , uranium

4572-450: Is less than 0.711% by weight (see 10 CFR 40.4 ). The military specifications designate that the DU used by the U.S. Department of Defense (DoD) contain less than 0.3% U. In actuality, DoD uses only DU that contains approximately 0.2% U. Enriched uranium was first manufactured in the early 1940s when the United States and Great Britain began their nuclear weapons programs. Later in

4699-427: Is only naturally formed by the r-process (rapid neutron capture) in supernovae and neutron star mergers . Primordial thorium and uranium are only produced in the r-process, because the s-process (slow neutron capture) is too slow and cannot pass the gap of instability after bismuth. Besides the two extant primordial uranium isotopes, U and U, the r-process also produced significant quantities of U , which has

4826-424: Is present. Uranium-238 is fissionable by fast neutrons and is fertile , meaning it can be transmuted to fissile plutonium-239 in a nuclear reactor . Another fissile isotope, uranium-233 , can be produced from natural thorium and is studied for future industrial use in nuclear technology. Uranium-238 has a small probability for spontaneous fission or even induced fission with fast neutrons; uranium-235, and to

4953-407: Is produced through the thermal decomposition of uranium halides on a hot filament. It is estimated that 6.1 million tonnes of uranium exists in ores that are economically viable at US$ 130 per kg of uranium, while 35 million tonnes are classed as mineral resources (reasonable prospects for eventual economic extraction). Australia has 28% of the world's known uranium ore reserves and

5080-555: Is radioactive, and precautions should be taken. It is also highly toxic. Whether ingested, inhaled, or absorbed through the skin , uranyl fluoride is corrosive and may harm internal organs, potentially resulting in death. Effects of exposure may be delayed. The U.S. government has been converting depleted UF 6 to solid uranium oxides for use or disposal. Such disposal of the entire D UF 6 inventory could cost anywhere from US$ 15 million to US$ 450 million. The vulnerability of DUF 6 storage cylinders to terrorist attack

5207-541: Is the main component of depleted uranium. Depleted uranium is notable for the extremely high density of its metallic form: at 19.1 grams per cubic centimetre (0.69  lb/cu in ), DU is 68.4% more dense than lead . Civilian uses include counterweights in aircraft, radiation shielding in medical radiation therapy , research and industrial radiography equipment, and containers for transporting radioactive materials. Military uses include armor plating and armor-piercing projectiles . The use of DU in munitions

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5334-441: Is then calcined to remove impurities from the milling process before refining and conversion. Commercial-grade uranium can be produced through the reduction of uranium halides with alkali or alkaline earth metals . Uranium metal can also be prepared through electrolysis of KUF 5 or UF 4 , dissolved in molten calcium chloride ( CaCl 2 ) and sodium chloride ( Na Cl) solution. Very pure uranium

5461-600: Is used for X-ray targets in the making of high-energy X-rays. The use of pitchblende , uranium in its natural oxide form, dates back to at least the year 79 AD, when it was used in the Roman Empire to add a yellow color to ceramic glazes. Yellow glass with 1% uranium oxide was found in a Roman villa on Cape Posillipo in the Bay of Naples , Italy, by R. T. Gunther of the University of Oxford in 1912. Starting in

5588-517: The U content, which is 55 ppm in uranium from the Oklo Mine as well as all other natural sources, but will be lower in depleted uranium in accordance with the degree of depletion. About 95% of the depleted uranium produced until now is stored as uranium hexafluoride , or (D) UF 6 , in steel cylinders in open air storage yards close to enrichment plants. Each cylinder typically holds up to 12.7 tonnes (14.0 short tons) of UF 6 . In

5715-537: The 1991 Gulf War , the Bosnia war , bombing of Serbia , the 2003 invasion of Iraq , and 2015 airstrikes on ISIS in Syria. It is estimated that between 315 and 350 tons of DU were used in the 1991 Gulf War. Most depleted uranium arises as a by-product of the production of enriched uranium for use as fuel in nuclear reactors and in the manufacture of nuclear weapons . Enrichment processes generate uranium with

5842-731: The Convention on Conventional Weapons of 1980, and the Chemical Weapons Convention . Yeung Sik Yuen writes in Paragraph 133 under the title " Legal compliance of weapons containing DU as a new weapon ": Annex II to the Convention on the Physical Protection of Nuclear Material 1980 (which became operative on 8 February 1997) classifies DU as a category II nuclear material. Storage and transport rules are set down for that category which indicates that DU

5969-519: The European Committee on Radiation Risk . DU from nuclear reprocessing has different isotopic ratios from enrichment-by-product DU, from which it can be distinguished by the presence of U . The only known natural source of uranium with a U content significantly different from 0.71% is found in the natural nuclear fission reactor at Oklo, Gabon . It can be "fingerprinted" as different in origin from manmade depleted uranium by

6096-1048: The GAU-8 Avenger cannon of the A-10 Thunderbolt II used by the United States Air Force . 25 mm DU rounds have been used in the M242 gun mounted on the U.S. Army's Bradley Fighting Vehicle and the Marine Corps 's LAV-25 . The U.S. Marine Corps uses DU in the 25 mm PGU-20 round fired by the GAU-12 Equalizer cannon of the AV-8B Harrier , and also in the 20 mm M197 gun mounted on AH-1 Cobra helicopter gunships. The United States Navy 's Phalanx CIWS 's M61 Vulcan Gatling gun used 20 mm armor-piercing penetrator rounds with discarding plastic sabots and

6223-547: The Gulf War . According to a 2013 study, despite the use of DU by coalition forces in Fallujah , Iraq , no DU has been found in soil samples taken from the city, although another study of 2011 had indicated elevated levels of uranium in tissues of the city inhabitants. Natural uranium contains about 0.72% U. Depleted uranium has lower mass fractions —up to three times less—of U and U than natural uranium. Since U has

6350-402: The Manhattan Project , another team led by Enrico Fermi was able to initiate the first artificial self-sustained nuclear chain reaction , Chicago Pile-1 . An initial plan using enriched uranium-235 was abandoned as it was as yet unavailable in sufficient quantities. Working in a lab below the stands of Stagg Field at the University of Chicago , the team created the conditions needed for such

6477-497: The Megatons to Megawatts Program . An additional 4.6 billion tonnes of uranium are estimated to be dissolved in sea water ( Japanese scientists in the 1980s showed that extraction of uranium from sea water using ion exchangers was technically feasible). There have been experiments to extract uranium from sea water, but the yield has been low due to the carbonate present in the water. In 2012, ORNL researchers announced

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6604-475: The Oklo Fossil Reactors . The ore deposit is 1.7 billion years old; then, uranium-235 constituted about 3% of uranium on Earth. This is high enough to permit a sustained chain reaction, if other supporting conditions exist. The capacity of the surrounding sediment to contain the health-threatening nuclear waste products has been cited by the U.S. federal government as supporting evidence for

6731-721: The Shippingport Atomic Power Station in Pennsylvania , which began on 26 May 1958. Nuclear power was used for the first time for propulsion by a submarine , the USS Nautilus , in 1954. In 1972, French physicist Francis Perrin discovered fifteen ancient and no longer active natural nuclear fission reactors in three separate ore deposits at the Oklo mine in Gabon , Africa, collectively known as

6858-484: The United Nations Institute for Disarmament Research , depleted uranium does not meet the legal definitions of nuclear, radiological, toxin, chemical, poison or incendiary weapons, as far as DU ammunition is not designed nor intended to kill or wound by its chemical or radiological effects. A number of anti-war activists specializing in international humanitarian law have questioned the legality of

6985-465: The United States (2.5%), Argentina (2.1%) and Ukraine (1.9%). In 2008, Kazakhstan was forecast to increase production and become the world's largest supplier of uranium by 2009; Kazakhstan has dominated the world's uranium market since 2010. In 2021, its share was 45.1%, followed by Namibia (11.9%), Canada (9.7%), Australia (8.7%), Uzbekistan (7.2%), Niger (4.7%), Russia (5.5%), China (3.9%), India (1.3%), Ukraine (0.9%), and South Africa (0.8%), with

7112-439: The age of the Earth . The most common isotopes in natural uranium are uranium-238 (which has 146 neutrons and accounts for over 99% of uranium on Earth) and uranium-235 (which has 143 neutrons). Uranium has the highest atomic weight of the primordially occurring elements. Its density is about 70% higher than that of lead and slightly lower than that of gold or tungsten . It occurs naturally in low concentrations of

7239-604: The break-up of the Soviet Union in 1991, an estimated 600 short tons (540 metric tons) of highly enriched weapons grade uranium (enough to make 40,000 nuclear warheads) had been stored in often inadequately guarded facilities in the Russian Federation and several other former Soviet states. Police in Asia , Europe , and South America on at least 16 occasions from 1993 to 2005 have intercepted shipments of smuggled bomb-grade uranium or plutonium, most of which

7366-432: The oceans may contain 10  kg (2 × 10  lb). The concentration of uranium in soil ranges from 0.7 to 11 parts per million (up to 15 parts per million in farmland soil due to use of phosphate fertilizers ), and its concentration in sea water is 3 parts per billion. Uranium is more plentiful than antimony , tin , cadmium , mercury , or silver, and it is about as abundant as arsenic or molybdenum . Uranium

7493-760: The pressurized heavy-water reactors such as the CANDU design. However as of 2013, about 10% of those built use that technology. Travelling wave reactors are a proposed type of reactor which can use depleted uranium as fuel. Uranium Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table . A uranium atom has 92 protons and 92 electrons , of which 6 are valence electrons . Uranium radioactively decays , usually by emitting an alpha particle . The half-life of this decay varies between 159,200 and 4.5 billion years for different isotopes , making them useful for dating

7620-540: The Czech Republic, which voted against the resolution in 2007, abstained. The two other states that voted against the resolution were Israel and the United States (both of which voted against in 2007), while as before China was absent for the vote, and Russia abstained. In June 2009, Belgium became the first country in the world to ban: "inert ammunition and armour that contains depleted uranium or any other industrially manufactured uranium." The move followed

7747-640: The Dean of the Sapienza University of Rome , Orso Mario Corbino , named ausenium and hesperium , respectively. The experiments leading to the discovery of uranium's ability to fission (break apart) into lighter elements and release binding energy were conducted by Otto Hahn and Fritz Strassmann in Hahn's laboratory in Berlin. Lise Meitner and her nephew, physicist Otto Robert Frisch , published

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7874-408: The Earth's outer core in the liquid state and drives mantle convection , which in turn drives plate tectonics . Uranium's concentration in the Earth's crust is (depending on the reference) 2 to 4 parts per million, or about 40 times as abundant as silver . The Earth's crust from the surface to 25 km (15 mi) down is calculated to contain 10  kg (2 × 10  lb) of uranium while

8001-742: The Geneva Conventions of 1949 have an obligation to ascertain that new weapons do not violate the laws and customs of war or any other international law. As mentioned, the International Court of Justice considers this rule binding customary humanitarian law. Louise Arbour , chief prosecutor for the International Criminal Tribunal for the Former Yugoslavia led a committee of staff lawyers to investigate possible treaty prohibitions against

8128-490: The Geneva Protocol of 17 June 1925—did not cover nuclear weapons, because their prime or exclusive use was not to poison or asphyxiate. This ICJ opinion was about nuclear weapons, but the sentence "The terms have been understood, in the practice of States, in their ordinary sense as covering weapons whose prime, or even exclusive, effect is to poison or asphyxiate," also removes depleted uranium weaponry from coverage by

8255-964: The Promotion and Protection of Human Rights resolution 2001/36. He argues that the use of DU in weapons, along with the other weapons listed by the Sub‑Commission, may breach one or more of the following treaties: the Universal Declaration of Human Rights , the Charter of the United Nations , the Genocide Convention , the United Nations Convention Against Torture , the Geneva Conventions including Protocol I ,

8382-691: The Russian government approved a federal program for nuclear and radiation safety for 2016 to 2030 with a budget of 562 billion rubles (ca. 8 billion USD ). Its key issue is "the deferred liabilities accumulated during the 70 years of the nuclear industry, particularly during the time of the Soviet Union". About 73% of the budget will be spent on decommissioning aged and obsolete nuclear reactors and nuclear facilities, especially those involved in state defense programs; 20% will go in processing and disposal of nuclear fuel and radioactive waste, and 5% into monitoring and ensuring of nuclear and radiation safety. Uranium

8509-419: The U.S. 560,000 tonnes (620,000 short tons) of depleted UF 6 had accumulated by 1993. In 2008, 686,500 tonnes (756,700 short tons) in 57,122 storage cylinders were located near Portsmouth , Ohio; Oak Ridge , Tennessee; and Paducah , Kentucky. The storage of (D) UF 6 presents environmental, health, and safety risks because of its chemical instability. When UF 6 is exposed to water vapor in

8636-804: The UK reported firing 1.9 tonnes of depleted uranium weapons in Iraq In March 2023, the UK government confirmed it was sending DU rounds to Ukraine along with its Challenger 2 tanks with its 120mm ammunition during the Russian invasion . In 1996, the International Court of Justice (ICJ) gave an advisory opinion on the " legality of the threat or use of nuclear weapons ". This made it clear, in paragraphs 54–56, that international law on poisonous weapons—the Second Hague Declaration of 29 July 1899, Hague Convention IV of 18 October 1907 and

8763-506: The ZEUS detector were the tracking components, the calorimeter and the muon detectors. The purpose of the ZEUS detector was to collect data to allow the reconstruction of physics events in a consistent way so they can be analyzed. The ZEUS Calorimeter was a uranium scintillator based sampling calorimeter and divided into three main sections: the BCAL (Barrel CALorimeter), FCAL (Forward CALorimeter), and RCAL (Rear CALorimeter). Each section

8890-538: The ZEUS experiment studied the internal structure of the proton through measurements of deep inelastic scattering by colliding leptons ( electrons or positrons ) with protons in the interaction point of ZEUS. These measurements were also used to test and study the Standard Model of particle physics as well as to search for particles beyond the Standard Model, laying the foundation to much of

9017-408: The air, it reacts with the moisture to produce UO 2 F 2 (uranyl fluoride), a solid, and HF (hydrogen fluoride), a gas, both of which are highly soluble and toxic. The uranyl fluoride solid acts to plug the leak, limiting further escape of depleted UF 6 . Release of the hydrogen fluoride gas to the atmosphere is also slowed by the plug formation. Like any other uranium compound, it

9144-427: The armor plating in the front of the turret, and there is a program to upgrade older tanks. Depleted uranium can be used as a tamper , or neutron reflector , in fission bombs . A high density tamper like DU makes for a longer-lasting, more energetic, and more efficient explosion. Most military use of depleted uranium has been as 30 mm ordnance, primarily the 30 mm PGU-14/B armor-piercing incendiary round from

9271-566: The bulk of the use, including common bathroom and kitchen tiles which can be produced in green, yellow, mauve , black, blue, red and other colors. Uranium was also used in photographic chemicals (especially uranium nitrate as a toner ), in lamp filaments for stage lighting bulbs, to improve the appearance of dentures , and in the leather and wood industries for stains and dyes. Uranium salts are mordants of silk or wool. Uranyl acetate and uranyl formate are used as electron-dense "stains" in transmission electron microscopy , to increase

9398-409: The civilian sector is to fuel nuclear power plants . One kilogram of uranium-235 can theoretically produce about 20  terajoules of energy (2 × 10   joules ), assuming complete fission; as much energy as 1.5 million kilograms (1,500 tonnes ) of coal . Commercial nuclear power plants use fuel that is typically enriched to around 3% uranium-235. The CANDU and Magnox designs are

9525-559: The continued use of depleted uranium weapons, highlighting that the effects may breach the principle of distinction (between civilians and military personnel). Some states and the International Coalition to Ban Uranium Weapons , a coalition of more than 155 non-governmental organizations , have asked for a ban on the production and military use of depleted uranium weapons. The European Parliament has repeatedly passed resolutions requesting an immediate moratorium on

9652-549: The contrast of biological specimens in ultrathin sections and in negative staining of viruses , isolated cell organelles and macromolecules . The discovery of the radioactivity of uranium ushered in additional scientific and practical uses of the element. The long half-life of uranium-238 (4.47 × 10 years) makes it well-suited for use in estimating the age of the earliest igneous rocks and for other types of radiometric dating , including uranium–thorium dating , uranium–lead dating and uranium–uranium dating . Uranium metal

9779-408: The decade, France and the Soviet Union began their nuclear weapons and nuclear power programs. Depleted uranium was originally stored as an unusable waste product ( uranium hexafluoride ) in the hope that improved enrichment processes could extract additional quantities of the fissionable U isotope . This re-enrichment recovery of the residual uranium-235 is now in practice in some parts of

9906-442: The development of uranium mining to extract the radium, which was used to make glow-in-the-dark paints for clock and aircraft dials. This left a prodigious quantity of uranium as a waste product, since it takes three tonnes of uranium to extract one gram of radium. This waste product was diverted to the glazing industry, making uranium glazes very inexpensive and abundant. Besides the pottery glazes, uranium tile glazes accounted for

10033-465: The element very slowly. When finely divided, it can react with cold water; in air, uranium metal becomes coated with a dark layer of uranium oxide . Uranium in ores is extracted chemically and converted into uranium dioxide or other chemical forms usable in industry. Uranium-235 was the first isotope that was found to be fissile . Other naturally occurring isotopes are fissionable, but not fissile. On bombardment with slow neutrons, uranium-235 most of

10160-493: The feasibility to store spent nuclear fuel at the Yucca Mountain nuclear waste repository . Above-ground nuclear tests by the Soviet Union and the United States in the 1950s and early 1960s and by France into the 1970s and 1980s spread a significant amount of fallout from uranium daughter isotopes around the world. Additional fallout and pollution occurred from several nuclear accidents . Uranium miners have

10287-503: The field and several crucial mistakes such as failing to account for impurities in available graphite samples which made it appear less suitable as a neutron moderator than it is in reality. Germany's attempts to build a natural uranium / heavy water reactor had not come close to reaching criticality by the time the Americans reached Haigerloch , the site of the last German wartime reactor experiment. On 2 December 1942, as part of

10414-468: The first sample of uranium metal by heating uranium tetrachloride with potassium . Henri Becquerel discovered radioactivity by using uranium in 1896. Becquerel made the discovery in Paris by leaving a sample of a uranium salt, K 2 UO 2 (SO 4 ) 2 (potassium uranyl sulfate), on top of an unexposed photographic plate in a drawer and noting that the plate had become "fogged". He determined that

10541-506: The fissile component, and on 29 February 1940, Nier used an instrument he built at the University of Minnesota to separate the world's first uranium-235 sample in the Tate Laboratory. Using Columbia University 's cyclotron , John Dunning confirmed the sample to be the isolated fissile material on 1 March. Further work found that the far more common uranium-238 isotope can be transmuted into plutonium, which, like uranium-235,

10668-611: The food people eat. Worldwide production of uranium in 2021 was 48,332 tonnes , of which 21,819 t (45%) was mined in Kazakhstan . Other important uranium mining countries are Namibia (5,753 t), Canada (4,693 t), Australia (4,192 t), Uzbekistan (3,500 t), and Russia (2,635 t). Uranium ore is mined in several ways: open pit , underground , in-situ leaching , and borehole mining . Low-grade uranium ore mined typically contains 0.01 to 0.25% uranium oxides. Extensive measures must be employed to extract

10795-537: The further use of depleted uranium ammunition, but France and Britain – the only European states that are permanent members of the United Nations Security Council —have consistently rejected calls for a ban, maintaining that its use continues to be legal, and that the health risks are unsubstantiated. In 2007, France, Britain, the Netherlands, and the Czech Republic voted against a United Nations General Assembly resolution to hold

10922-479: The human body to eliminate half the amount in the body) for uranium is about 15 days. The aerosol or spallation frangible powder produced by impact and combustion of depleted uranium munitions (or armour) can potentially contaminate wide areas around the impact sites, leading to possible inhalation by human beings. The actual level of acute and chronic toxicity of DU is also controversial. Several studies using cultured cells and laboratory rodents suggest

11049-489: The impact of uranium munitions by late 2010—to coincide with the General Assembly's 65th Session, four voted against, 34 abstained and 13 were absent. As before Britain and France voted against the resolution. All other European Union nations voted in favour or abstained: the Netherlands, which voted against a resolution in 2007, voted in favour, as did Finland and Norway , both of which had abstained in 2007, while

11176-434: The issue. The report was largely split between states concerned about depleted uranium's use, such as Finland , Cuba , Japan , Serbia , Argentina , and predominantly NATO members, who do not consider the use of depleted uranium munitions problematic. In December 2008, 141 states supported a resolution requesting that three UN agencies: United Nations Environment Programme (UNEP), WHO and IAEA update their research on

11303-800: The late Middle Ages , pitchblende was extracted from the Habsburg silver mines in Joachimsthal , Bohemia (now Jáchymov in the Czech Republic) in the Ore Mountains , and was used as a coloring agent in the local glassmaking industry. In the early 19th century, the world's only known sources of uranium ore were these mines. The discovery of the element is credited to the German chemist Martin Heinrich Klaproth . While he

11430-409: The late 1990s to armor-piercing tungsten. Only the US and the UK have acknowledged using DU weapons. The Soviet Union and Russia have used DU weaponry since the 3BM-32 Vant, designed for the 125 mm tank cannons. In 2018, TASS reported that Russia was arming some of its T-80 models with 3BM60 Svinets-2 DU rounds. 782,414 DU rounds were fired during the 1991 war in Iraq, mostly by US forces. In

11557-540: The long-term environmental impacts of depleted uranium identified by the United Nations Environment Programme, states should adopt a precautionary approach to its use. In December 2014, 150 states supported a United Nations' General Assembly resolution encouraging states to provide assistance to states affected by the use of depleted uranium weapons, in particular in identifying and managing contaminated sites and material. In contrast to

11684-601: The metal from its ore. High-grade ores found in Athabasca Basin deposits in Saskatchewan , Canada can contain up to 23% uranium oxides on average. Uranium ore is crushed and rendered into a fine powder and then leached with either an acid or alkali . The leachate is subjected to one of several sequences of precipitation, solvent extraction, and ion exchange. The resulting mixture, called yellowcake , contains at least 75% uranium oxides U 3 O 8 . Yellowcake

11811-491: The military sector is in high-density penetrators. This ammunition consists of depleted uranium (DU) alloyed with 1–2% other elements, such as titanium or molybdenum . At high impact speed, the density, hardness, and pyrophoricity of the projectile enable the destruction of heavily armored targets. Tank armor and other removable vehicle armor can also be hardened with depleted uranium plates. The use of depleted uranium became politically and environmentally contentious after

11938-422: The mineral pitchblende is credited to Martin Heinrich Klaproth , who named the new element after the recently discovered planet Uranus . Eugène-Melchior Péligot was the first person to isolate the metal, and its radioactive properties were discovered in 1896 by Henri Becquerel . Research by Otto Hahn , Lise Meitner , Enrico Fermi and others, such as J. Robert Oppenheimer starting in 1934 led to its use as

12065-440: The mushroomed tip improves penetration properties compared to the complete dispersal that takes place with tungsten penetrators, therefore DU penetrators are 20% more effective than tungsten rounds. The impact and subsequent release of heat energy causes it to ignite when in contact with oxygen. When a DU penetrator reaches the interior of an armored vehicle, it catches fire, often igniting ammunition and fuel and possibly causing

12192-584: The newly discovered metal itself (in fact, that powder was an oxide of uranium ). He named the newly discovered element after the planet Uranus (named after the primordial Greek god of the sky ), which had been discovered eight years earlier by William Herschel . In 1841, Eugène-Melchior Péligot , Professor of Analytical Chemistry at the Conservatoire National des Arts et Métiers (Central School of Arts and Manufactures) in Paris , isolated

12319-656: The only commercial reactors capable of using unenriched uranium fuel. Fuel used for United States Navy reactors is typically highly enriched in uranium-235 (the exact values are classified ). In a breeder reactor , uranium-238 can also be converted into plutonium-239 through the following reaction: Before (and, occasionally, after) the discovery of radioactivity, uranium was primarily used in small amounts for yellow glass and pottery glazes, such as uranium glass and in Fiestaware . The discovery and isolation of radium in uranium ore (pitchblende) by Marie Curie sparked

12446-757: The other permanent members of the United Nations Security Council supported the resolution as China was absent for the vote, Russia abstained and the United States voted against the resolution. In September 2008, and in response to the 2007 General Assembly resolution, the UN Secretary General published the views of 15 states alongside those of the International Atomic Energy Agency (IAEA) and World Health Organization (WHO). The IAEA and WHO evidence differed little from previous statements on

12573-421: The penetrator because it is self-sharpening and flammable . On impact with a hard target, such as an armored vehicle, the tip of the projectile will be "mushroomed", while the back of the projectile is still a rigid solid, this leads to adiabatic shearing and together with the spin of the projectile results in a shedding of the mushroomed plastic phase in such a way that it forms a new sharp tip. This shedding of

12700-487: The physical explanation in February 1939 and named the process " nuclear fission ". Soon after, Fermi hypothesized that fission of uranium might release enough neutrons to sustain a fission reaction. Confirmation of this hypothesis came in 1939, and later work found that on average about 2.5 neutrons are released by each fission of uranium-235. Fermi urged Alfred O. C. Nier to separate uranium isotopes for determination of

12827-707: The possibility of leukemogenic , genetic , reproductive , and neurological effects from chronic exposure. According to an article in Al Jazeera , DU from American artillery is suspected to be one of the major causes of an increase in the general mortality rate in Iraq since 1991. A 2005 epidemiology review concluded "In aggregate the human epidemiological evidence is consistent with increased risk of birth defects in offspring of persons exposed to DU." A 2021 study concluded that DU from exploding munitions did not lead to Gulf War illness in American veterans deployed in

12954-557: The possibility that these organisms could be used in bioremediation to decontaminate uranium-polluted water. The proteobacterium Geobacter has also been shown to bioremediate uranium in ground water. The mycorrhizal fungus Glomus intraradices increases uranium content in the roots of its symbiotic plant. In nature, uranium(VI) forms highly soluble carbonate complexes at alkaline pH. This leads to an increase in mobility and availability of uranium to groundwater and soil from nuclear wastes which leads to health hazards. However, it

13081-943: The previous biennial resolutions, Germany moved to an abstention from supporting to the resolutions. Prior to the vote, in a report to the United Nations Secretary General requested by 2012's resolution published in June 2014, Iraq had called for a global treaty ban on depleted uranium weapons. Depleted uranium has a very high density and is primarily used as shielding material for other radioactive material, and as ballast . Examples include sailboat keels , as counterweights and as shielding in industrial radiography cameras. Most civilian nuclear reactors , as well as all naval reactors , require fuel containing concentrated U, and production of that fuel generates depleted uranium as residue. Some power-generating reactors design are able to use unenriched fuel, for example

13208-511: The same kinetic energy , with less aerodynamic drag and deeper penetration because of a higher pressure at point of impact. DU projectiles are inherently incendiary because they become pyrophoric upon impact with the target. Because of its high density, depleted uranium can also be used in tank armor, sandwiched between sheets of steel armor plate. For instance, some late-production M1A1 and M1A2 Abrams tanks built after 1998 have DU modules integrated into their Chobham armor , as part of

13335-521: The same treaties as their primary use is not to poison or asphyxiate, but to destroy materiel and kill soldiers through kinetic energy . The Sub-Commission on Prevention of Discrimination and Protection of Minorities of the United Nations Human Rights Commission , passed two motions —the first in 1996 and the second in 1997. They listed weapons of mass destruction , or weapons with indiscriminate effect, or of

13462-610: The science done at the Large Hadron Collider (LHC) at the CERN particle physics laboratory today. The German national laboratory DESY was founded in 1959 and started operating its first particle accelerator in 1964. Since then, it has been a highly regarded center for particle physics , photon science, astroparticle physics , and the development, construction and operation of particle accelerators. The design effort for ZEUS can be traced back to 1982. A Letter of Intent

13589-550: The shorter half-lives of these parents and their lower production than U and Pu, the parents of thorium: the Cm/ U ratio at the formation of the Solar System was (7.0 ± 1.6) × 10 . Some bacteria, such as Shewanella putrefaciens , Geobacter metallireducens and some strains of Burkholderia fungorum , use uranium for their growth and convert U(VI) to U(IV). Recent research suggests that this pathway includes reduction of

13716-509: The soluble U(VI) via an intermediate U(V) pentavalent state. Other organisms, such as the lichen Trapelia involuta or microorganisms such as the bacterium Citrobacter , can absorb concentrations of uranium that are up to 300 times the level of their environment. Citrobacter species absorb uranyl ions when given glycerol phosphate (or other similar organic phosphates). After one day, one gram of bacteria can encrust themselves with nine grams of uranyl phosphate crystals; this creates

13843-509: The stabilization of political and economical turmoil of the early 1990s. For example, in 1993 there were 29 incidents ranking above level 1 on the International Nuclear Event Scale , and this number dropped under four per year in 1995–2003. The number of employees receiving annual radiation doses above 20 mSv , which is equivalent to a single full-body CT scan , saw a strong decline around 2000. In November 2015,

13970-515: The successful development of a new absorbent material dubbed HiCap which performs surface retention of solid or gas molecules, atoms or ions and also effectively removes toxic metals from water, according to results verified by researchers at Pacific Northwest National Laboratory . In 2005, ten countries accounted for the majority of the world's concentrated uranium oxides: Canada (27.9%), Australia (22.8%), Kazakhstan (10.5%), Russia (8.0%), Namibia (7.5%), Niger (7.4%), Uzbekistan (5.5%),

14097-513: The time splits into two smaller nuclei , releasing nuclear binding energy and more neutrons. If too many of these neutrons are absorbed by other uranium-235 nuclei, a nuclear chain reaction occurs that results in a burst of heat or (in some circumstances) an explosion. In a nuclear reactor, such a chain reaction is slowed and controlled by a neutron poison , absorbing some of the free neutrons. Such neutron absorbent materials are often part of reactor control rods (see nuclear reactor physics for

14224-495: The use of DU in weapons. Their findings were that: There is no specific treaty ban on the use of DU projectiles. There is a developing scientific debate and concern expressed regarding the impact of the use of such projectiles and it is possible that, in future, there will be a consensus view in international legal circles that use of such projectiles violate general principles of the law applicable to use of weapons in armed conflict. No such consensus exists at present. According to

14351-727: The use of such munitions by the US, UK and other countries during wars in the Persian Gulf and the Balkans raised questions concerning uranium compounds left in the soil (see Gulf War syndrome ). Depleted uranium is also used as a shielding material in some containers used to store and transport radioactive materials. While the metal itself is radioactive, its high density makes it more effective than lead in halting radiation from strong sources such as radium . Other uses of depleted uranium include counterweights for aircraft control surfaces, as ballast for missile re-entry vehicles and as

14478-528: The use of uranium in manufacturing and metalwork. Tools made with these formulas remained in use for several decades, until the Manhattan Project and the Cold War placed a large demand on uranium for fission research and weapon development. A team led by Enrico Fermi in 1934 found that bombarding uranium with neutrons produces beta rays ( electrons or positrons from the elements produced; see beta particle ). The fission products were at first mistaken for new elements with atomic numbers 93 and 94, which

14605-636: The use, production and procurement of uranium weapons. It also called on the Parlatino's members to work towards an international uranium weapons treaty. In November 2010 the Irish Senate passed a bill seeking to outlaw depleted uranium weapons, but it lapsed before approval by the Dáil . In December 2010, 148 states supported a United Nations' General Assembly resolution calling for the states that use depleted uranium weapons in conflict to reveal where

14732-638: The vehicle to explode. DU is used by the U.S. Army in 120 mm or 105 mm cannons employed on the M1 Abrams tank . The DU content in various ammunition is 180 g in 20 mm projectiles, 200 g in 25 mm ones, 280 g in 30 mm, 3.5 kg in 105 mm, and 4.5 kg in 120 mm penetrators. DU was used during the mid-1990s in the U.S. to make hand grenades , and land mines , but those applications have been discontinued, according to Alliant Techsystems . The US Navy used DU in its 20 mm Phalanx CIWS guns, but switched in

14859-466: The weapons have been fired when asked to do so by the country upon whose territory they have been used. In April 2011, the Congress of Costa Rica passed a law prohibiting uranium weapons in its territories, becoming the second country in the world to do so. In December 2012, 155 states supported a United Nations' General Assembly resolution that recalled that, because of the ongoing uncertainties over

14986-542: The whole facility (later, the town of Arco became the first in the world to have all its electricity come from nuclear power generated by BORAX-III , another reactor designed and operated by Argonne National Laboratory ). The world's first commercial scale nuclear power station, Obninsk in the Soviet Union , began generation with its reactor AM-1 on 27 June 1954. Other early nuclear power plants were Calder Hall in England, which began generation on 17 October 1956, and

15113-680: The world's largest single uranium deposit is located at the Olympic Dam Mine in South Australia . There is a significant reserve of uranium in Bakouma , a sub-prefecture in the prefecture of Mbomou in the Central African Republic . Some uranium also originates from dismantled nuclear weapons. For example, in 1993–2013 Russia supplied the United States with 15,000 tonnes of low-enriched uranium within

15240-584: The world; e.g. in 1996 over 6000 metric tonnes were upgraded in a Russian plant. In the 1970s, the Pentagon reported that the Soviet military had developed armor plating for Warsaw Pact tanks that NATO ammunition could not penetrate. The Pentagon began searching for material to make denser armor-piercing projectiles . After testing various metals, ordnance researchers settled on depleted uranium. The US and NATO militaries used DU penetrator rounds in

15367-588: Was believed that uranium was relatively rare, and that nuclear proliferation could be avoided by simply buying up all known uranium stocks, but within a decade large deposits of it were discovered in many places around the world. The X-10 Graphite Reactor at Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee, formerly known as the Clinton Pile and X-10 Pile, was the world's second artificial nuclear reactor (after Enrico Fermi's Chicago Pile) and

15494-556: Was from ex-Soviet sources. From 1993 to 2005 the Material Protection, Control, and Accounting Program , operated by the federal government of the United States , spent about US$ 550 million to help safeguard uranium and plutonium stockpiles in Russia. This money was used for improvements and security enhancements at research and storage facilities. Safety of nuclear facilities in Russia has been significantly improved since

15621-508: Was subdivided transversely into towers, and longitudinally into EMC (Electro-Magnetic Calorimeter) or HAC (HAdronic Calorimeter). The smallest subdivision in the calorimeter was called a cell. Each cell was read out by two photomultiplier tubes (PMTs), which helped ensure that there were no holes in the coverage if one of the two PMTs failed. Uranium was chosen as an absorber so that the calorimeter would be compensating. Electrons and photons deposit energy differently from hadrons , but in

15748-476: Was submitted in 1985. The ZEUS detector was operational with the first collisions of the HERA collider in 1992. The last electron–proton collisions at ZEUS were recorded on 30 June 2007. The other multi-purpose experiment at the HERA collider was the competing H1 experiment. Since May 2012, the former ZEUS detector hall has been used as a lab space for the international European XFEL project. The main components of

15875-472: Was that the natural radioactivity allowed the calorimeter's sensitivity to be conveniently monitored. 53°34′29″N 9°53′44″E  /  53.574603°N 9.89555°E  / 53.574603; 9.89555 Depleted uranium Depleted uranium ( DU ; also referred to in the past as Q-metal , depletalloy or D-38 ) is uranium with a lower content of the fissile isotope U than natural uranium. The less radioactive and non-fissile U

16002-491: Was the first reactor designed and built for continuous operation. Argonne National Laboratory 's Experimental Breeder Reactor I , located at the Atomic Energy Commission's National Reactor Testing Station near Arco, Idaho , became the first nuclear reactor to create electricity on 20 December 1951. Initially, four 150-watt light bulbs were lit by the reactor, but improvements eventually enabled it to power

16129-454: Was working in his experimental laboratory in Berlin in 1789, Klaproth was able to precipitate a yellow compound (likely sodium diuranate ) by dissolving pitchblende in nitric acid and neutralizing the solution with sodium hydroxide . Klaproth assumed the yellow substance was the oxide of a yet-undiscovered element and heated it with charcoal to obtain a black powder, which he thought was

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