The efficiency of a surface for eollecting and holding the fallout meterial le important. It is not aurprising thatthe highest dose rate readings as well as biological effests were noted on the hair of the netives and also on parts of the exposed body where perspiration was present. Further, it was observed that even one layer of light cotton material was suffielent to pretect against beta akin damage in most eases*, This was due probably not te the relatively small attenustion of the betas by the elothing but rather to the physieal situation of holding the radioactive material at some distance from the skin, whieh effect would be relatively large. an added consideration is the possibility of high beta doses delivered to personnel from the falout material lying on the ground and other surfaces. ; If the highest degree of contanination -unsidered under this polley ie safe when in direct eontact with the skin, then the beta dose from an equally contaminated ground will not be hazardous. Polley Iii for diseussion on unequal contamination on personnel.) (See Povever, it is true that the contanuination may exceed the amount te deliver dose rates given in table II and yet not be great enough to consider evacuation. Some personnel may not go indoors and those who did vill evectuclty be releused fron this restrictive action and then may walk around in a relatively highly conteminated area. Because of the sore linited range | of the beta, the location of createst concern is the lower legs. One report estimates a beta to gamma dose rate ratio of about 75 to 1 at 10 centineters above the ground.™* Under Poliey I it was recom * TTRe923. on Era sue 1949 reazion“SIPFIED) aenaDyson, ob J Se ieOa ERDL ULCLLA ASSSS!IFIED D3