The naturally occurring isotopes of Potassium are:
39K (abundance 93.10%)
40K (abundance 0.0118%)
41k (abundance 6.88%)
40 K is radioactive and decays by B-decay with a half life of 1.29 multiplied by 10^9 years.
Question: Using the definitions for the decay constant and for the Becquerel, calculate the activity of 1 gram of naturally occurring potassium.
Activity of a given amount of radioactive material found in nature is calculated as the decay constant multiplied by the number of radioactive nuclei.