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 US is planning an experiment to check the effectiveness of the aging plutonium in its atomic weapons National Public ...

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 ...