Given:
Initial activity of charcoal, A0 = 15.3 disintegrations per gram per minute
Half-life of charcoal, = 5730 years
Final activity of charcoal after a few years, A = 12.3 disintegrations per gram per minute
Disintegration constant, =
Let the sample take a time of t years for the activity to reach 12.3 disintegrations per gram per minute.
Activity of the sample,