controls, although it was not extremely high (Kimura et al., 1956). After 8'/. years and 10 years, '’Cs- and Sr content in the urine of the fishermen revealed no significant increase. At the same time the results cf whole body counting showed nosignificant difference between fishermen and controls. Thus, the external irradiation seemed to play an impotant role in early effects. SYMPTOMS AND SIGNS IN THE EARLY STAGE epee sees eee nnd SY em = : an 1, tenisSaat kocytes 5 Figure 1 summarizes the symptoms and signs in the early stage. HEMA ath epe.gmenlnseanec2 teetaoh haeTOME each patient’s behavior on the boat. The dose to each person differed depending on his behavior and the position of his cabin. The integrated dose to the thyroid from ‘I was inferred as about 20 to 120 rads from external countings of radioactivity in the thyroid region during the 4 to 7 weeks after the initial exposure. Significant amounts:of radioactivity were found in the urine samples collected at about 4 weeks after the explosion. The radioactivity decreased rapidly, namely at about 6 months post explosion the activity in the urine was barely detectable. Radiochemical analysis of several organs from the fatal case showed that the radioactivity of these organs was clearly higher, when compared with the % No, 100} 23} 1 oot 75P 50 be 25F 15F 10+ headache 5} fever more than38°C _--" of 9 fatigue = ~ = . =< a peer 75r . 100; 23+ XN x . « anorexia — ol eee tel nausea ~._ ad age c@ vomiting” ~~.._ — ee ~ diarrhoea wot oat skin lesions ast 277epilation x 25 1 5 - ft ¢ “\ 7. haemorthage 0 fo date 1-5 NAIFies 6 mene-neee 8 retetalc TS RAEBasan Eel atodate Lh ; Hematological Eff T. KUMATORI i EidatataTe eS 66 tT to ee nz. \, conjunctivitis H St a sleet L 6-10 I-15 16-20 21-26 27-1 March 1 2-6 1 L 7-11 12-12 Agril Fig. 1 Symptons and signs in the early stage. number of * ‘The total t the 4th to counts at abou than 2,000): count of less leukocyte j one case, the ¢ e minimum between thes s ship Wa Similar relation Fr) as shown in the dose i n betw atio Fig. 2 Correl ses to the do the estimated mal nut ni body and the mi of neutrophils. s 2 In most case in €8 cells increased metamy' some cases, the | especially with id ns era damage, 4 co mphc end stage. Ly cases. Leukocyte ¢* sT eosinophilia wa ntinu Eosinophilia co ill 1 st and one case Erythrocytes of } At the time 2. in ti was observed © The Price-Jones st, a of normalat fir ¢ corrseponded to * Platelets, etc- Platelet coun: e Most of the fish ! re s st of other te i d l in genera an *% 1. Comparison e When thes !