radioactive particles

As the bivalves feed on organic matter and filter the water around them, their inner tissues and hard shells begin to reflect whatever is in their environment -- including radioactive particles.

He explained that other types of wastewater generally do not contain many radioactive particles, but oil and gas wastewaters found deep in the earth and brought out by fracking often contain specific unique element ratios -- a kind of signature that can be traced.

The blast disabled several satellites, including a British one named Ariel, as radioactive particles from the burst came in contact with them.

The nearby Navajo Nation is scattered with old uranium mines — over 500, in fact — awaiting cleanup, exposing locals to risk of "lung cancer from inhalation of radioactive particles, as well as bone cancer and impaired kidney function from exposure to radionuclides in drinking water," according to the EPA.

All four were wearing full face masks, and test results showed none of them had ingested radioactive particles.