(NNDC82), and 3) branching fractions and decay schemes fromtheseventh edition of the Table of Isotopes (Le78). Since each “nug$ide which’"we accapnted for was the n> member of an isobaric chain, the sumber “of ¢atoms at time& would “ine. crease or decrease relative to the number_Present. at time of detonation -because of decay and in-ggewth phenomega of precufsor. isobars. Decay and in-growth phenomena were aécounted for using the fal lowing equation which was originally described by Bateman (Balé) and later recgst in a more ‘general form by Skrable (Sk75). -" ee A n 2 i=n ° E ist jzn-1 (3 Aa, =n A; Fj, a) |\jeis is3¢ joi . "ome > ~-. 2.5% where = _ “oo =: 40 ~r; t Fe a2 JU Aie us}, # 44) Pom. TT ( Pp pi > a pn ee A, = the number of atoms ofthentb meaber af an jsobaric chain at time > .¢ post-detonation per oni. fisaion,: i. s. ay # theindependent yield= 0 oftthe ith sf|in the AD Lsobaric chain per unit fission, a X; = decay constant of the jth isobar, og . ¢, ae . oa f5, je Lagtxbranching fraction of the jt isobar ‘leading to the. _ecreation of the 3°th _t 1 isobar, . - oe = time post-BRAVO detonation. “= my we ” ORE, “te “hii”maeof Eqs. (3) and 5allowed us to calculate ait fission products present:“g¥the time of exposure:{ see Table 13). We also ficluded in Table 13, the importan£é precursor transuganics and activation products which were based on the.Tauzyki measurements on d#¥26 (Ts55) and the useof parent- daughter transformation. equations given by Bateman (Bal0). —™/ od = a: ‘Ron-Fission-Fragment Nuc tides Not Accounted. for.“fhe nuclides which may have been aye,Ste at some level but which remain unaccounted ‘forare 7 Be, 24Na,- es‘ Se, 57¢o, 580, 68¢q, 64cy, 67c¢u, 240Np, . 24lam, and 283m, The eS “otte >dhort-Llived_ac iy, ‘i wproducts, 2hn aiid 56un, might have accounted‘for “7one. arét the_expogur syete . mured at 2.2 days atRongelap Is- land. Botg tabulated. he ohotda-energy cteunfrom a BRAVO fallou€ sample col- lected at RongelapIsfgndz(BoS6).: The:falteutsample was reported ‘to be analyzed at 4 days post-detonation. We determined that the spectrum has a minor peak energy’ around 850 keV. The.santedbity of* the“peek wadabout 5 *g.7% of the total photonTinieThe nuektde HMivin has 4 tharacterifstic photon at 847 keV but so da” ther oucljges” whict:may have been present (RSIC73},. ‘Mather indicated: EeHiese shiet-lived-activation products.-m sacqgunt=for setguch as 20 to 50%Ea oapton“intensdky ‘luring the first dayiiipa “detonat ions. howaver, most Zana aad: WMo*activity would be.observed close to @-potor of creation (Ma56). tethe rcateofBRAY0 this.yas near Namy Island,Bikini.Atoll.-: Therefore, we: owe, that. tia ant 2ON. contributed much Bhotohtexposure at Ronge lap“Ieland. - vt be ky ek. . _ 3 Be cess a < =, We‘spprdkiuated” the?exposure rate contribution from all notaccounted-for nuclides -at distances fer from the detonation site on the basis of - 37 -