ee dn eee te nette induced activity. The decay rate of the residual radiation from fallout will follow approximately the expressions i az 71,2 I,t and & rf tat = hath (ii) th Where: Ip = exposure rate at time t Ty = exposure rate at unit time t = time r = exposure beiween times t, and t, where t; = 10 seconds It is expected that the decay of the residurt radiation will vary wit weapon design. For exeacplo, ths prosente of Np‘? would tad to decrease tha shsoluta value of ths dscay exponent for a period of tins. 1.3.3. Absorptionin Air. Tha assorption of unceattered gumua redia~ tion inhorossagous oie 12 ¢yponentdal with dietanco. Prom a point source of c. snozsargatie rediiation, the varietion of inteneity with disicrea ie expressed a8 _ Ty exp(-D) Ih 2 . (1. 2) au were: 1 D we ewe we . intenstty at distance D = source Intensity BKB D total linen ahousstion goeCielont (Eats t syelly daevene 3 with Ingres stint carma anscry) = distunse omy aed KOLOD Ata a CDE! Sistant win Pevatten beams $y cts i wgotion rout a dey ad -Meun sacvhoe b oto @j tion that vill ba Ayseat “3s S 3 ~ 2.2 fa eco}isshhy fos an pow for Pl: ver lTabops ves . frets dees oc ty a de epate owed oy Zetant womuv tog wha ne ee ee ee ee et