. : 106 pally of three radioisotopes, Ry19 | nytS and its daughter Rh-~~, The data and calculations in appendix H also strongly indicate that a single fallout particle could produce a recognizable erythema. Lon! auinatioofClothrz In the cese of contamination ef clething, higher dose rates might te This was exemplified in tolerated than those for exposed parts of the body, the natives where no beta burns were observed under clothing of the most highly contaminated personnel. (This does not include such areas as under the waist line where materiel apparently collected end was held in place.) On the other hand, very large increases in contaminetion should not be tclerated since it is possible for the clothing to be rearroenged so as to bring the contaminated surface in contact with the sxin. Further, it is not unlikely that one may rub his hands over his clothing and then through the hair where the material could be held in place for relatively long periods of time. PateExnosureto theVornds A further consideration is the beta dose to the hands resulting from hendling objects contaminated with fallout material. Although some data are available on bete burns from handling radioactive objects, the conditicns are so different from those associated with fallout that comparisons prob- ably would not be valid.* If the above assumptions and calculations are correct concerning con- tamination of a general area from fallout, then the transfer of all the radioactive material to the hands from an object of equal area would not constitute a hazard. object Thus, one might consider using as criteria for moni— ose edin *"Beta Ray Burns of Human Skin". iv abov 0 Knowlton, et al. Medical American Association, V. 141, No. 4. - 37 - Pane ee eeee oe Be oni n onnel Journal Sept. 24, 1949.