Hematological Effects on Heavily Irradiated Japanese Fishennen Oexvtes of the fisher men, Stable cells 97 _ur 0.14 (1.10) 2. 28 (9 13) 3. 45 (14,15) 2. 88 (15/16) and morphological abnormalitics of spermatozoa were also observed. Indications of recovery were observed in some cases after about one ;year, but mostly : ) first signs of regeneration did not showearlier than about 2 years after ex- unstable cells 94 posure, with following production of children. (sy 0.14 (1:10) SUMMARY 0. 46 (3,13) The hematological changes of Japanese fishermen exposed to fallout in 0. 45 (515) 1954 were reported with other findings. Generally speaking,it is difficult to estimate correctly the exposed radiation dose soon after the accident. Therefore, treatment of heavily irradiated persons should be decided by the daily appraisal of clinical and laboratory findings. From this point, hematological changes are an important information 0.56 (6, i6) Se 1.20 (6,10) 2.11° (12) 0. 67 (4 10) to decide the therapy which should be given to heavily irradiated subjects. 0.74 As to the Japanese fishermen, it seems to be very important as well as (6 12) necessary to detect the significance of subtle changes such as they arestill ser of cases examined, observed in hematological and cytogenetical examinations. ‘ere observed (Table 2). REFERENCES ‘markably higher than Amano, S. (1953): Genshi Bakudan Saigai Chosa Hokokushu. I], 914. Cakujutsu Shinko Kai, Tokyo. at stable abnormal ities r to the Ph! chromo - ‘Ups according to th e alues of neutroph ils mean values ofstabl e extent of the ini tial onded to the esti mat- > observed in 5 ca ses, alities. While Stab le otypes of their own, aryotypes. ilarities with he mazoa is describe d for muni numbers we re wering of mobi lity Nihon Anprews, G.A., SITTERSON, B.W., KretcuMar, A.L. and Brucer, M. (1961): OR TN LR NENTy Hann ae a wt Pg ition... 67 per cent 29 per cent 1...4 per cent 71 Diagnosis and Treatment of Acute Radiation Injury, 27, World Health Organization, Geneva. Cronkite, E.P., Boxp, V.P. and Dunnam, C.H.(ed.) (1956): Some Effects of Ionizing Radiation on Human Beings. U.S. Government Printing Office, Washington, D.C. Guskova, A. K. and BatsocoLov, G. D. (1956): Proceedings of the International Conference on Peaceful Uses of Atomic Energy, 11, 35, United Nations, New York. Hastervik, R.J. and ManiNneLui, L. D. (1956): Proceedings of the International Conference on Peaceful Uses of Atomic Energy, Il, 25, United Nations, New York. HEMPELMAN, L.H., Lisco, H. and Horrman, J.G. (1952): Annals of Internal Medicine, 36 279. IsHiwara, T. and Kumarort, T. (1965): Acta Haematologica Japonica, 28, 291. IsutnaRa, T. and Kusators, T. (1967): Human Radiation Cytogenetics, 144, North Holland Publishing Co., Amsterdam. Isnimara, T. and Kumatonri, T. (1969): Japan Journal of Genetics, 44, Suppl. 1, 242. Jammer, H.P. (1961): Diagnosis and Treatment of Acute Radiation Injury, 83, World Health Organization, Geneva. Kixucut, T., Wakisaka, G., Akacl, H. and Goto, H. (1954): Bulletin of the In- stitute for Chemical Research, 4, Kvoto University, Kyoto. Kimura, K., Minami, E., Honpa, M. et al. (1956): Research in the Effects and Influences of the Nuclear Bomb Test Explosions, I, 497, Japan Society for the Promotion of Science, Tokyo.