RADIOACTIVITY

noun
22 Scrabble
23 WWF
R 1
A 1
D 2
I 1
O 1
A 1
C 3
T 1
I 1
V 4
I 1
T 1
Y 4

Definition

Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.

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