1. The problem statement, all variables and given/known data I have attached the question below. 2. Relevant equations I'm not sure how to answer the question. 3. The attempt at a solution I started by calculating the specific dose rates for each isotope, but I cannot get any data for 90Sr using: http://www.nucleide.org/Laraweb/index.php This is what I have so far. For 1000 Bq of 137Cs, 850 photons per second are emitted with an energy of 662 keV. This equals a specific dose rate of 84 μSv/h/GBq at one meter. For 1 μCi this is 84 μSv/h/GBq x 10-6 x 37 GBq = 3108 μSv/h. For 1000 Bq of 131I, 810 photons per second are emitted with an energy of 364 keV. This equals a specific dose rate of 0.4 μSv/h/GBq at one meter. For 2 μCi this is 0.4 μSv/h/GBq x 10-6 x (2X37 GBq) = 2.96X105 μSv/h.