active deposit
Physics
noun
A deposit of radioactive material formed by the decay of a radioactive gas or emanation.
Origin
Early 20th century; earliest use found in Ernest Rutherford (1871–1937), physicist.
- black soil
- blacksome
- black someone's eye
- black something out
- black south-easter
- black soybean
- black spleenwort
- black spot
- black spring
- black spruce
- Black Spy
- black squirrel
- black-step
- Black Sticks
- Black Stone
- Blackstone River
- Blackstone, Sir William
- black stork
- blackstrap
- black stripe
- black studies
- black stump
- black sugar
- black sugar maple
- black swallow