Question

A sample of radioactive material has an apparently constant activity of $2000$ dis/min. By chemcial means, the material is separated into two fractions, one of which has an initial activity of $1000$ dis/min. The other fraction decays with a $24$-hour half-life. Estimate the total activity in both samples $48$ hours after the separation. Explain your estimate.

Answer 1

First fraction

$A\circ =100$ dps

Second fraction $\frac{t_1}{2}=24$ hrs

Since radiation sample and has $\alpha$ has a constant activity of 2000 dps. So it will remain same after 48 hrs also.