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, ...

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 ...

This, as he found out, isn’t something you should do lightly, as the one he used ended up containing an interesting mix of radioactive materials, including small amounts of plutonium-239 ...

Japan’s plutonium stockpiles in Britain and France totaled 21.8 tons and 15.4 tons, respectively, as of December 2020. Britain shut down its only M OX plant in 2011, which means it can no longer ...