In: Physics
A nuclear medicine source made of 32P with half-life of 14.3 days emits beta particles at 0.70 MeV. Ten grams of 32P concentrate in a tiny tumor in the bladder after injection. The activity is initially 1.0 x 1010 Bq. Compute the dose (in units of Gy) delivered at the tumor two half-lives after injection. For a more accurate answer, you should integrate the dose rate over time as the source strength changes due to radioactive decay.