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Uranium-236
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<p>Uranium-236 (236U or U-236) is an <a href="/facts/Isotope_of_uranium/zWIQ6MVL">isotope of uranium</a> that is neither <a href="/facts/Fissile/XJR9qoxW">fissile</a> with <a href="/facts/Thermal_neutron/UMKR4XgJ">thermal neutrons</a>, nor very good <a href="/facts/Fertile_material/Gt9u52G8">fertile material</a>, but is generally considered a nuisance and long-lived <a href="/facts/Radioactive_waste/MjYh5tlu">radioactive waste</a>. It is found in <a href="/facts/Spent_nuclear_fuel/jWDWvJ6d">spent nuclear fuel</a> and in the <a href="/facts/Reprocessed_uranium/xNEHPzNQ">reprocessed uranium</a> made from spent nuclear fuel. </p>