radioactive fallout

https://doi.org/10.1351/goldbook.R05085
The deposition on the ground of @R05077@ substances from nuclear explosions and other injections of @R05077@ material into the atmosphere.
Source:
PAC, 1982, 54, 1533. (Glossary of terms used in nuclear analytical chemistry (Provisional)) on page 1541 [Terms] [Paper]