Beginning in the late 1950s, the U.S. met this challenge by developing nuclear batteries known as radioisotope thermoelectric generators (RTGs) and producing plutonium-238 (Pu-238) as their fuel, ...

Plutonium is currently stored at Sellafield in a powder form but needs to be processed before it is disposed of A multibillion-pound plant to process plutonium is expected to bring thousands of ...

The UK government has announced that the country's stockpile of some 140 tonnes of civil plutonium - currently stored at the Sellafield site in Cumbria - will be immobilised and eventually disposed of ...