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, ...

The government says it will dispose of its 140 tonnes of radioactive plutonium - currently stored at a secure facility at Sellafield in Cumbria. The UK has the world's largest stockpile of the ...

They confiscated plutonium and depleted uranium in decorative vials and polymer cubes that Lidden kept by his bedside after buying from a US science collectables website to complete a real-life ...

The plutonium then served as fuel for sustained ... and potassium (K) known as NaK. This alloy was chosen for its excellent thermal conductivity and low melting point, enabling efficient heat ...