Plutonium is a silvery radiological poison

Plutonium is a radioactive chemical element (atomic number 94). It is a silvery metal that sometimes has a yellow tarnish and exists in six varieties with different densities and crystal structure. It was first detected in the U.S. in 1940 and is created by bombarding uranium with neutrons. It is an ingredient in nuclear weapons and nuclear reactors.

Plutonium is a radiological poison and must be handled with very special equipment.