To the reviewer, a rain of radioactive particles was more current.

Every day we are hit by a blizzard of radioactive particles.

"Our invention probably wouldn't detect radioactive particles buried deep in the ground," he said.

Within a second's time, a radioactive particle has a certain probability that it will decay.

A radioactive particle does not ever have to decay.

As noted above, radioactive particles in food or water may be harmful if consumed.

As a result eight children, including three of her own, were contaminated by the radioactive particles mixed in the dust.

All of these radioactive particles then fall back to the ground, producing the fallout.

Wherever the explosion and the wind took the radioactive particles is now a hot spot.

Inside it is a radioactive particle with a 50-50 chance of decaying in, say, one minute.