Some of this natural plutonium is related to uranium. Some has been found in meteorite dust deposited in the seabed. So, plutonium-244 is the heaviest naturally occurring element that we know of.

Instead, the tremendous heat generated by the natural decay of plutonium-238—up to 475º F in the New Horizons probe—is converted to electricity in a radioisotopic thermal generator (RTG).

With the nation’s nuclear energy plants mostly quiet, Japan has little use for potentially dangerous plutonium stockpiles.

The plutonium could also have come from nuclear fuel reprocessing at INEEL, or from a landfill at the lab where wastes from Colorado’s Rocky Flats weapons plant are stored.

Am allegedly rediscovered musical genre called "plutonium jazz" is going viral on TikTok, but what's it all about and is it even real? Here's what you need to know.

Given plutonium’s long half-life, we humans have permanently altered what once was our natural environment. We no longer live in an environment of purely natural background radiation.

Highly toxic plutonium has seeped into the soil outside the troubled Fukushima Dai-ichi nuclear power complex in northeastern Japan, officials say. The amounts detected in two different soil ...

Plutonium-238 is 280 times more radioactive than Plutonium-239, the plutonium isotope used in atomic bombs and as a “trigger” in hydrogen bombs.

Nuclear weapons are spreading. This plutonium scientist is trying to stop that Siegfried Hecker serves as a scientific shuttle diplomat, building ties with rival nuclear researchers the world over.

A piece of the plutonium used in the first atomic bombs has indeed been sitting around UC-Berkeley for decades.

Scientists discover why plutonium doesn't stick to magnets The discovery proves that plutonium's magnetism is not necessarily missing, only sporadic.