Rabe On Tuan Sooaures The work of Henriques! suggests that at the d epth of 0.09 am in living poreine skin (mexieum thickness of e pidermis) thet "1400 ¢ 300 roentgen-equivalent-beta" (delivered over short periods of tine so that they may be esumed te be instantaneous) is required to produce recognisable trenseyidermal injury. The gurve of biological damage rises rather sharply so that at a dose of just wrier 2000 rep (at 0.09 om), the epidernis may be expected to exfoliate and in the wajority of cases go on to develop chronic radiation dermatitis persisting for months. The preceding discussion suggests that, using the gaume dose rates listed in the criteria under this ielicy, shich are bazed on an estinated 16 rosatyen infinity gamma dose, as high as 2,000 reps might be delivered to the basal layer of the epidernis over a period of tine eovered by the lifetize of the radioactive material. There Lave been instances where the caleulated infinity gauze dose in areas where persome] were present around the Nevada Froving Grounds have reached 1218 reentgens but there have been no know cases of beta burns in these areas. The musber of persons involved DOEY areas of highest contanination was relatively small, perhaps a few dozen, and with an observed duration of fallout ef about one hour it 1s possible that they were not in a position to receive the full fallout. Likewise, nimite aroay of the skin may have been so affected yet not detected or reported. In other areas encompassing some 2,000 people the infinity gamma dese was about eight roentgens and no instances of beta injury appeared. 1 gr-git. 2D