CPB Budapest 2017

Radioactive Decay: Specific Activity A

specific

N

2ln

N

A

A

= λ=

A

specific

M

T

M

2/1

• Molar mass of 226 Ra is 226.02 g/mol

1/2 of decay for 226 Ra is 1600 a

• T

= 5.0458 x 10 10 s

• Thus considering 1a = 365x24x60x60 s T 1/2

A = 6.02214 x10 23 mol -1 (Avogadro-Number)

• and N

spec for 226 Ra is 3.7x10 10 Bq/g = 37 GBq/g =1 Ci/g

• A