he estimates that there is less than 1 mg of plutonium-240 in the source. It’s also worth remembering that the americium in your smoke detector came from plutonium: it’s a natural decay ...

plutonium-239 and plutonium-240, which were indeed identified by careful laboratory investigations. In addition to background contamination from US and former Soviet nuclear tests in the last ...

On this day in 1940, the element plutonium was first isolated by researchers at the University of California, Berkeley. Here’s a quiz on it.