; nme . ) Discussion of the Biological Factom As longer periods of time are involved in the delivery of a civen rediatio: doo, lesser biological effects my be expected, Fron te time o” fallout anti” the tise of evacnation probably will be a matter of hours w ic’ }as ber sonsidered essentially an instantan- @ous dose, i,6., 4 “tologioal dose fac or ‘a 1/1. eould Le accorplis ed tc time of retur From the tine evacuation coro abl; would be a matter of days, go the biological factor as bee estina ed at 3/4, From 15 days after fallout until one year later is essentially a docatio: of one year, so the biological factor nas bee est. rated at t/7. Tow J be ated t ere 4s no caleclation after one year, because it is excectad u wer actual evnditions of rediolorical and weathering that pro'ably) no sige’ “ia * dose will te delivered after a years tine, It 1s rvcog:ized tat te prec'@e qant'‘ies sug, ested for te tiolor~ deal factor oa wt se mpported ?y co clus ve evidenoa. expect tat te deliver It is reasoratle to of a give- rat‘ation dose over @ period of man. days will have lese biolorical effect! veness t a- an instantaneous one (neclecting genetic effects’ ad treat te exte g's: a the per'od to essentially ow year miould yield @ sti 1 lower tinloyical factor, is the work ‘ne niece of supportive evidence of” Strandrvist* where I-ray doses to the skin rere fractionated into equal daily amounta, and the tiolerical ef’ects compared to a one treatment dose. A Leiedes. plot of total doses werm:s days after initial treatment yielded straigyt Lines, For example, ‘*# curve fer skin necrosis indicated a ratio of JOOC/ UM reesupens for # -Stevert, Tal! We. * 72 Tolerance by Touiging Fadlatlons”* Vol, 2X,ho,P3C.Aup cae co atmer! wersus TS daily equally eo ote Prevention of Infurtes Cause¢c oc ‘ .