1. The problem statement, all variables and given/known data A patient receives an injection of 1.11×108 Bq of 131I,30% of which goes to the thyroid, having a mass of 20 g.What is the average dose rate in the organ? 2. Relevant equations D=1.60×10–10AE Gy s–1 3. The attempt at a solution A=(1.11x108x(30/100))/20=1.665x106Bqg-1 E=0.192Mev =1.60x10-10 (1.665)(0.192Mev) = 51μGy s–1 This is my solution. Can anyone point out the mistake here.