Tiseussio: of t.e Rlolocfeal Factor: 1: the deliver of a rive: radiation expectad, As lower perlocds of time are involved dosc, lesser Liolosical effects mm, te From the time of fallout util the time of evacuation orvbably will 'e a matier of hours wiie uas bec:. gonaidered essentisil. a: insta stan eous dose, 1.¢., tc liological dose factor ie 1/1. Prom the time svacumtion could ‘e accomplis:ecd to time ef retur:. probabil: would be a miter of da:s, minliaie fo the ‘iological factor as been estizmated at J/m until one vear later is essential fiector sas tee. estimitad at SIT. From 15 dacs after fallout a durativ.. of one year, so t.s biological It wil Le rwted v ere is wo calculation aver ose year, recacse it is expected uncer asectual evndi tions of radioloricel aod weat-erin: that pro abl. oo eirpnifica.t dose will be delivered after a ears time. It is recoriizec t at te precise quantities mi ested for t e¢ } iolo-deal factor es ot “e grcorted &) eu.clusive evicenos. expect tat te deliver It 4s reasonalle to of gs rive: pacdiatio: dose over a period of many days willoiave levy tinlovtcal effectiveness t a; an instactanseous one (ne: lector DOE/NV., genetic effects) ad tat H.e extenslo. of te period to esve tially ov year 8 old dele a still lower *-ivlorical factor, is t.e work One nleee of supportive evidence of “tranievist™ where ‘-ray doses to the skin rere fractionated 3 equal cats arovata, and tie Liolorical effects compared to a one treat- bent dose. A and plot of total dozes versus days after initial treatment sielded strai.” t lines, For exmaple, the curve for sxin necrosis ‘dicated a ratio of 3000/6700 reentrens for a one treatment versus 15 dail, equally vheverts elf kW, "The Tolerance roe and the Prevention of Injuries Caused - loniging Fadiations®. F030 Jee es te Sadie oe Vol. why! Dex236Aur. Wh? . -_ UNCLASSIFIED .7 10 '