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, ...

(NewsNation) — High levels of plutonium have been found around Los Alamos, the birthplace of the atomic bomb, raising alarms ahead of plans by the federal government to restart nuclear weapons ...

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 ...