These signs reached the peak in about the 3rd4th week and subsided gradually. These skin lesions including epilation were observed on parts of the body not covered by clothing and on the navel region where radioactive custs from neck were deposited. Elistologically, these skins were similar to ordinary cadiccdermatitis. Remarkable epilation was observed in 20 patients. Two patients who did not wear hats at the ctume of the accident revealed complete epilational necrosis. Aficroscopically, coagulation necrosis and cell infiltration in the necrotie scalp was observed at about the 4th week. Vhese skin lesions recovered gradually, Thin and delicate hairs began to grow again at the beginning of Mis, and in 2-3 months they grew back almost completely. But. T-2 and T 7 have alopecia even now. In some persons, capillary dilatation, depigmentation and pigmentation of skin are still observed m= the navel region. For the skin lesions cvery possible treatment was applied. For decontamination, mechanical washings with Na-EDT A or warm water were done. The hair of head, axifla and pubes was shaved off. Vhe nails were cut off. In one and half months superficial contamination was almost removed. The distribution of surface radivactivity and skin lesions is shown in Fig. 20° Radostrye Contamination Rudiodermatitis 3. Haematological Observations Leucneples Total number of leucocytes decreased gradually, showing minimum count at about 4-8 weeks after the exposure. Five cases revealed a count of less than 2,000, mm’, thirteen less than 3,000, andfive less than 4,000. In one case, the leucocyte level depressed to 800. A correlation was found between these minimum count and the doses of individual external irradiation. Neutrophil level also depressed. Between the tth-8th weeks all of the cases got minimum values, which were proportional to the dase of radiation received (Vig. 3). In most cases a shift to the left of the nucleus was observed. Lymphopenia was noted between the 2Ind-8th weeks in all cases, Leucocyte count began to inerease since 8th week, At that time, metumyelocytes and myelocytes appeared in peripheral blood of some cases. In most Cases eosinophilia and in some cases monocytosis were remarkable, especially with the indication of recovery. Eosinophilia continued in some cases for several years without proof of parasite. Neutrophil and lymphocyte levels recovered gradually. However, cumulative distribution curve of total leucocyte count at the 6th year was still slightly displaced to the left of normal Japanese, and in several cases, number of lymphocytes was below 2,000,'’mm/’. Motility and phagocytosis of neutrophils depressed remarkably. Although they recovered gradually, after one year these functions in some cases were still loser than in normal persons. Erythrocytes At the time of hospitalization, a few patients were slightly anaemic (RBC 3,000,000, mm’). se wot ne, gs Morked Moderate Slight Ulcer Fig. 2.) we Erosion ee Erythema Epilation Distribution of Radtodermatitis!! No reticulocyte was observed in them at the critical stage. The cumulative percentage curves changed as in Fig. 4. Colour index was higher than 1.0. The PriceJone’s curves of erythrocytes diameter were displaced to the right of normal one at first, and returned to almost normal after one year. These changes corresponded to changes of erythroblasts diameter in bone marrow.