CPB Ljubljana 2018 course book

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

ln

2

0



   T ) T ( exp N

0

2/1

2/1

2



or equivalently

A

0

) T(A

 



) T ( exp A

1

2/

0

2/1

2