Question

³H decays with a rate constant of 0.0563/yr. What is the activity of a 0.699 g sample in curies?

Answer 1

1 Ci = 2.79×10^-6 × moles × t_1/2

= 2.79×10^-6 × $\frac{0.699}{3}$ × $\frac{1n^2}{\lambda}$

= 2.79×10^-6 × $\frac{0.699}{3}$ × $\frac{0.693}{0.0563}$

= 8 × 10^-6 yr