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 ...

The immobilization process will include transforming plutonium into a form similar to ceramic or stone. Experts call it a "positive step." We recently reported on the plans of Sweden, which has ...

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.