Chapter 43, Problem 015 A 66 kiloton atomic bomb is fueled with pure 235U, 4.0% of which actually undergoes fission. (a) What is the mass of the uranium in the bomb? (It is not 66 kilotons-that is the amount of released energy specified in terms of the mass of TNT required to produce the same amount of energy.) (b) How many primary fission fragments are produced? (c) How many fission neutrons generated in the fissions are released to the environment? (On average, each fission produces 2.5 neutrons. Assume 2 neutrons per fission crate further fissions.) 1 megaton of TNT produces 2.6 x 1028 MeV of energy. Assume each fission event releases 200 MeV of energy. Courtesy Martin Marietta Energy Systems US. Department of Energy