HAT MIAN proportion of contamunart fron: most surfaces That remaining Is firmiy * ved and is not lthels to become airborneensily [fa personnel decon tamination center i established ot shold be relatively mobile and isolated from more per manent buildings where detinitive care ds given This stems from the fact that contamuinat.on can only be transferred. tiet destroved. and ‘he decontamination area is Tikes to become oyuite “hot” ina relatively short time Tinned goods ‘an be eaten with complete safety and ios highly unlikely that city water <vstenis outs de the area of blast danage v1] be conhaninaced soon after a burst. One thing appears te be certain—anyeffects from nterma radiation wii be long range and will be of ne concern in the acute period. Tot.tl body radiation from gamma rays, and skin irradiat on from beta emitters will be the chief radiological concer: at early times following wo expioston 6.36 sill be available and the falling cadiossetive mater tal may aetually be visible of fallout will depend or 99 ue asurably vetter off than within the area of ind thermal damage. Voch reaaed to etfectiveness of shelters in the read trea. the following estimates have been A frame house would reduce the total joe cece ved by one-half, and a briek or conrete -trueture would be more effective. A moement would reduce the total exposure to ome tenth of its value. Ina shelter of thickness eqrivadent to three feet of earth, the dose would 2 rednueed to one five-thousandth of its value, (areal erased forcing complete protection in the most heav\ oltaminated areas. t should alse be noted. on the other hand, uot Shihe tie deeay of fission product radiacosas extremely rapid over the first few min- its after deronation, the rate of decay becomes ersideradly less rapid im the succeeding hours . Phas, with fallout occurring some hours ‘he blast, .f adequate shelter is not availibe. eorher evacuation may be better than resagan partial -helter and on rapid deeay of ve radiation field, Starting at 1 hour after ifter Evasive Action, Protection From Fallout Some warning of possitve fallour Se TURY MADEN E] oS \s stared. the patters wind velocities ind other weather conditvans. und the pattern is thus difficult to predict imder the best of circum stances. However, toi be apparent thar i: closer-in areas. fallout mas dot oecur fOr sey eral minutes after the blast aust us pertod nay extend to several hours it sreater clistances na with slower wind velocit eDhos.there is seme time for evasive action CUStaePabiOn taiterdit woo “roo shutements as “more than SO percent of » hadatioy dose fron: atomic debris will be fevered sidan of hours of the explosion time” bee cris rf fallout occurs immediately after » e fe allow some advantaze ts oe aken ot the deca. of fission product m diate ug osite ster ene in tion of an area a few dive after the “a lent 141 intact. suchas water art, ne essent, i), ment, ete. poser. re tenting eye De rhs sep = \ beste | sy ou the area obvieusly will not be as t would be for earber fallout matertal. Estimation of the Severity of Ex- posure to Gamma Radiation with storing of sulficien’ food usa water t Facilities mins. for tae cic -t cot oectrped for several hours, the rate beats 4 + 1 oaetoration. Ff the maximum fallout and 1iN mum expose rates ima fallout area tlow aainplete prera adequate shelters ration for anextended -ta How- out peer ooclof } hourwe. a, the dose rare at Ll hours st he sd} percent of what it was at 10 hours. Suthigien cune probapby wo ui be available to allow peru vey a oaiven dose rate will fall to about OU hours after the blast. 2 given dose toed fal by only L) percent of its value in eer be given to evacuatiig tie area fF possible fill out patterns have beer meestoeved cad ape be lieved to be predictable Mou tay be possitle totake shelter tast bioercertoof ait» value by | hour later. Predictions From Physical Estimates of Dose (hoe chsolute sensitivig, of man to radia- / eect e hpown. and of it were feasible to de- re the close to groups under catastrophe