8 PRIVACY ACT MATERIAL REMOVED sible to calculate the skin dose accurately. The dose was sufficiently large, however, to produce epilation and widespread lesions of the skin in 90% of the Rongelap group, beginning about 12 to 14 days after the exposure. In the less heavily exposed groups (Ailinginae and Rongerik), the lesions did not appear until approxi- mately 20 days after the accident. In the Utirik group, radiation lesions of the skin did not appear. Thelesions occurred primarily on the exposed parts of the body not protected by clothing. Those who remained under shelter during the fall-out developed less severe or no lesions. Someprotection was afforded those who bathed during this period. Almost simultaneously with develop- ment of skin lesions, spotty epilation of the scalp was showing complete regrowth of hair. noted (fig. 34). Epilation was usually accompanied or preceded bylesions of the scalp. This was more extensive and severe amongthe children (birth to 15 years). Over 90% of the children showed some degree of epilation, as compared to 28% in the older age group. Re- growth of hair of normal color and distribution was noted beginning about nine weeksafter irradiation and was complete six months after the accident (fig. 3B). The developing lesions did not follow the identical course as observed by Knowlton and co-workers‘ in in- dividuals after handling concentrated fission products or nw 4, Knowiton, N. P., Jr., and others: Beta Ray Burns of Human Skin, J. A. M. A. 141: 239 (Sept. 24) 1949. (i 2m o, i Sonta Code s PRIVACY ACT MATERIAL REMOVED