caece of the absorption medium, and produced a consequent change in the shape of the gamna-rate-versus-time curves during this period. 1.3 THEORY The gamma radiation omitted from a nuclaar datonation may te divided into two portions; initial and residual reiiation. Tha residual portion may includa radiation both from fallout and froa nautron-induced activity. 1.3.1 Initdiale-<Geor saReddation, For devices with yinlds of lass tran 100 kt, in whichthe hyarodjnasle erfect is uall, the initial radiations are divided approxinitely as showa in Table 1.1 (from Sufersuca 4). TAGLB LoL The Freooy PastIticd sag DUITIAGL 2 Olas IOmS POM FISSTON-TYFR BVIGS Froa Reference & Yschaniaa Fercont of Total Fissica Sasrez Total Zoeorgy yer Stizatoa tat Frost Noutrana Pro pt Cu-sag? 40 40 Colayed heulrowe Ou Master ehat Guts Yiwatog Pic tant Tahae Fiseton Pract teutrhinog 2.7 2.7 5.5 3 8 3% Soh 11 0.2 *Hoatly susccrk-d in toe davice jor contributions to inittal-gamra rodlatioa are from ths fiassLen-preduct et cama the geraa rediabtca fron moatron esphum by i (nay) in Saczimlogiva co ‘poncaha ond] taoe . 9 yrecuph Es VAS ara rearly sorbed da tha e@avics dteelf ad cee of 11tile ctealfienn 29 cutaidg tha f4r. fonemictuse ae poode.iasta ah clogs 0’ times wfve Y Peubon ey Por ft) tlog ester ora. view (. cfarenca Pee wwe,to