NE STUD 124 Midterm: ne124-fa2006-mt2-Ahn-soln
Document Summary
Department of nuclear engineering, university of california, berkeley. Solution set for mid-term ii: (1) d (2) c (3) e, (1) 1: (1) radiotoxicity of 1 g of u-238 is 1. 11 m3. (2) in uranium ore, there are u-238 and u-235, and their decay daughters. 99. 3% of uranium is u-238, whose radioactivity is 1. 22e4 bq for 1 gram of u. 0. 7% of uranium is u-235, whose radioactivity is 5. 55e2. Decay daughters of each uranium isotope are assumed to be in secular equilibrium, that is, the same radioactivity for all nuclides in the chain. So, the radionuclide with the smallest mpc is the most toxic among the nuclides in the chain. From the u-238 chain, pb-210 has the smallest mpc, and gives 33 m3 for its toxicity. From the u-235 chain, ac-227 has the smallest mpc, and gives 3 m3 of toxicity.
