Question

A thallium source with a half-life of 3.7 years was certified at 10 kBq 10 years ago. What is its activity now?

Answer 1

the activity of thallium is 1.54 kBq .

Step-by-step explanation:

given,

half life = 3.7 years

R₀ = 10 kBq

time = 10 years

`R = R_0* e^((-0.693)/(t_(1/2))* t)`

`R = 10* e^((-0.693)/(3.7)* 10)`

R = 10 × (0.153667)

R = 1.5367 ≈ 1.54 kBq

hence, the activity of thallium is 1.54 kBq .