An average adult body contains about 0.10?Ci of K (A-40 Z-19), which comes from food.
A. How many decays occur per second?
B. The potassium decays produce beta particles with energies of around 1.4 MeV. Calculate the dose per year in sieverts for a 61kg adult. Answer in Sv/year
C. Is this a significant fraction of the 3.6mSv/year background rate? Answer as percent of background rate
