A radio nuclide with half life T=14.3 days is produced in a reactor at a constant rate q=109 nuclei per second. How soon after the beginning of production of that radio nuclide will. Its activity be equal to A=108 disintegrations per second. Plot a graph of its activity with time.

Question

anonymous · Answer

$$Activity = -dN/dt = \lambda N$$. 
$$N(t) = N_0 e^{\lambda t}$$. 
Thus, first find N using the first equation, and then find t.