a a += oO ia v* T (A, Mp - 23) 45 }- me MME m ae no aay jeg e J CS edth GS pan Fw pi prj “ - > A, = the number of atoms of the nth member of an isobaric chain at time t post detonation per unit fission, the independent yield at t = 0 of the ith isobar in the An isobaric chain per unit fission, A\; = decay constant of the gth isobar, = branching fraction of the jt" isobar leading to the creation of the j* + 1 isobar, t = time post BRAVO detonation. The use of Eqs. 3 and 4 led to the inclusion in Table 5 of all fission products with the exclusion of only a few of the dosimetrically insignificant ones. A few important transuranics and activation products were included in Table 5 based on the Tsuzuki measurements on day 26 fallout (Ts55) and use of parent-daughter transformation equations given by Bateman (Bal0). d. Non-Fission Fragment Nuclides Not Accounted For The nuclides which may have been present at some level but re- main unaccounted for are Be-7, Na-24, Mn-56, Fe-55, Fe-59, Co-57, Co-58, Co-60, Cu-64, Cu-67, 0-240, Np240m, Np-240, Am-241 and Cm-242. Two short lived activa- tion products, Na-24 and Mn-56, might have accounted for some of the exposure rate measured at day 2.2 at Rongelap Island. Borg (Du56) tabulated the photon energy spectrum from a BRAVO fallout sample collected at Rongelap Island. fallout sample was reported to be analyzed at 4 days post detonation. The The spec- trum showed a significant peak energy at 850 keV. Mn-56 has a characteristic photon at 847 keV but so do about 30 other nuclides that were present in fallout at that time (RSIC73). Mather (Du56) indicated that short-lived neutron activa- 19