CPB Budapest 2017
Radioactive Decay: Half Life T 1/2
The time needed for half of the radionuclides to decay , or equivalently the activity of a sample to be reduced to half its initial value, is called half life, T 1/2 :
N
2ln
0
=
= ⇒ λ− T ) T ( exp N
0
2/1
2/1
λ
2
or equivalently
A
0
= =
λ−
) T(A
) T ( exp A
2/1
0
2/1
2
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