Fallout

Fallout
The radioactive dust particles that settle to earth after the denotation of a nuclear device. It is also used to describe dust particles settling from smoke, etc.
Feasibility study ...

Fallout is a general term applied to Radioactive materials, produced by detonation of a nuclear device in the atmosphere, which fall back to earth.

Radioactive fallout carried by the wind was later found in sheep in the UK, on clothing worn by people throughout Europe, and in rain in the United States.

radioactive fallout Airborne or deposited radioactive debris, including fission products, from a nuclear detonation.
radioactive material Any material which spontaneously emits particulate or electromagnetic ionizing radiation.

Background Radiation: Radiation from cosmic sources; naturally occurring radioactive materials, including radon (except as a decay product of source or special nuclear material), and global fallout as it exists in the environment from the testing ...

background radiation: Background radiation includes radiation from cosmic sources, naturally occurring radioactive materials (including radon), and global fallout (from the testing of nuclear explosive devices).

Radiation from cosmic sources; naturally occurring radioactive materials, including radon and fallout from nuclear weapons tests.
Beta (particle) ...

See also: Radioactive, Reduce, Hazard, Contamination, National