Rake Oo Hines Exposures The work ef Henriques] wagzests thet at the ¢ epth ef 0.09 m in living poreine akin (maximm thickness of e pidernis) that "1400 ¢ 300 roentgen—equivalent—beta" (delivered over short periods of time po that they may be amumed te be instantansou:; 14 required to produce recognisable transeriderta: injury, The euvve of biological damage rises rether sherply po that at a dose of Just under 2XX rep (at 0,09 mn), the epiderzis may be expected to exfoliate and in the majority of eases go on to develop chronie radiation dermstitis persisting for aonths. The preceding discissior suggests thet, using the gacca dose rates listed in the eriteria under this Policy, which are bezed on an estinated 10 roentgen infinity gamma dose, as high as 2,00 reps might be deliveredto the basal layer of the epiderm!s over « period of tine eovered by the iifetine of the radioactive material. There have bean instances where the ealculated infinity gamma dose in areas where personnal werw present aroim’ the Fevada Proving Grounds have reached 12-15 rcentgens but tiers have been oo mow cases of beta burns in these areas The number of persons involved in these areas of highest contamination was relatively smal’, purhaps a few dozen, and with an observed durstion of fallout of about one hour it is possible that they were not in « position to receive the full fallout. Likevise, minute areas of the akin may have been so affected put not detected or reported. In other areas sneorpassing same 2,00 pecple the infinity gamca dose vas about eight roertzens end no instances of beta injury appeared. 1 gr.git. mecisecvamecny Ferns ce nants aeeAsee acTA mmo —~ be Mldae soraRUN oe my 6-5 ~