What is depleted uranium and how is it used in weapons?
Depleted Uranium (DU) is nuclear waste. Uranium naturally occurs as three different isotopes U234, U235 and U238. Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons. This means that they behave in the same way chemically, but different isotopes release different amounts and types of radiation. The radioactive properties of DU, which is chiefly uranium 238, differ from those of uranium 235. Unlike U238, U235 is fissionable. This means that it is so unstable that firing neutrons at it can produce a self-sustaining series of nuclear reactions, releasing huge amounts of energy. This is the basis of nuclear weapons and nuclear power. However, before U235 is used, it needs to be concentrated as it only makes up a small proportion of naturally occurring uranium, around 0.7%. U238 makes up more than 99% of natural uranium and is less radioactive. After natural uranium has had most of the U235 removed from it, it is called depleted uran
