a ot eae etaaal ae bs ge ean ne ae a neh - 5 me iil dias, t nended that ceusideratian be given to evacuation when the gamma dose rate reading at threes feet was, for example, about 6.2 r/hr at Bf} hours Joughly, this would correspond to about 44) reps/hr of beta at 10 centimeters. Qf course, this aetivity decays and aleo it is presumed that personnel would be sent indoors, st least for a few hours, On the ether hamd, it strongly suggests that biolegically significant doses may be delivered to the feet if not protected. Skin lesions ware frequent on the bare feet of the natives evacuate: during °ASTLE. This probably was a combination of beta dose from material on the ground and from that soeuffed Up over the bare feet and then elinging te the skin. (Io lesions were observed on the bottom of the feet, undoubtedly due to the thick epidermis.) »: It vould be expected that normal elosed-type footwear (os coupared ‘te een) open sandals) would afford adequate protection to the feet from sush high beta doses as discussed here. There is still no guarantes that beta radiation from material on the ground will not deliver significant biological doses to the ankles and perhaps lower legs, after’ pent are released from staying indoors. For example, if the beta dose at 10 centimeters above the ground is 460 repstr at #43 hours, it would be about 190 repghr three hours later and 12C reps/hr six hours later. Cue further possibility is the accumulation of redicastive naterial around the ankles and lower legs resulting from normal walking about the area. This is discussed under Policy [1]: