CPB Ljubljana 2018 course book

Radioactive Decay: Specific Activity A

specific

(Bq.kg -1 ) of a radioactive source of mass m containing a

The specific activity A

specific

single radionuclide of activity A is given by:

m A

A specific



Using the decay constant λ, the specific activity A

for a pure radionuclide can be

specific

calculated by:

N

2ln

N

A

A

A





specific

M

T

M

2/1

where N

A is the Avogadro constant and M is the molar mass of the radionuclide:

A = 6.0221367 10 23 mol -1

N