22 APPENDIX 2 DETAILS OF THE CALCULATION The purpose of these calculations is to relate the surface concentration (uC i/m?) of every radionuclide significant to the external gamma-ray exposure levels (mR/hr) as a function of time and fractionation behavior. A. Fission Products A total of 152 fission products and 25 neutron-induced nuclides were included in the computerized calculations described stepwise below. Unfractionated fission product distribution FY(A) where FY(A) " 1. > FV(A), j ° a. 2 fission yield of mass chain A for a given event, FY(A); = fission yield of mass chain A from 2334 2354 238y or Pu by fission spectrum or 14 MeV neutrons (Ne73) (table in computer program), a. = fraction of total fissions due to a given fission type (input data).