a 70 tlematological T. KUMATORE 72-h culture: No. of cases examined No. of cells analyzed Aneuploid cells % 10 693 2. 88 Fishermen 13 881 2. 05 Fishermen 15 1102 2.90 16 1248 2. 48 Fishermen 10 750 2.27 Fishermen 12 950 2. 00 Cases Control l abne and morphologica were € tions of recovery Chromosome abnormalities in peripheral lymphocytes of the fishermen, data from 1965 to 1967. . 1965 1966 Fishermen 1967 Stable cells % (/)* 0.14 unstable cells % (/)* 0.14 (1,10) (1/10) (9/13) (3/13) 2. 28 3, 45 (14/15) 2. 88 (15/16) 0. 46 0. 45 (5/15) 0. 56 (6/16) 48-b culture: 1966 1967 1.20 0. 67 (6/10) (4/iG) (9/12) (6/12) 2.11 0.74 * Numberof cases showing the abnormal cells per total number of cases examined. ween Table 2 nerat first signs of rege g llowin posure, with fo The hematologic: ed s 1954 were report ki: ea sp Generally the dose soon after dec sons should be is | findings. From th era} to decide the th pa Ja e th As to tect necessary to de tc ma observed in he so high (Table 2). 2. Unstable abnormalities such as dicentrics, etc. were observed (Table 2). 3. The frequency of stable abnormalities was remarkably higher than in controls (Table 2). 4. The detailed analysis of stable cells revealed that stable abnormalities were divided following 3 types: a, stable cells with balanced chromosomeconstitution ...67 per cent b. stable cells with deletionof a chromosome... 29 per cent c. stable cells with excessive chromosome material...4 per cent 5. In 3 cases small chromosomes which are similar to the Ph! chromosome were found. 6. The examined fishermen wereclassified in3 groups according to the degree of the injuries indicated by the minimum values of neutrophils shown shortly after the exposure. It was found that the mean valuesof stable and of unstable cells were higher in proportion to the extent of theinitial damage. Minimum values of neutrophils roughly correspondedto the estimated external radiation dose. 7. Chromosome abnormalities in bone marrow were observed in 5 cases. All of these abnormalities were limited to stable abnormalities. While stable cells in the peripheral lymphocytes showed various karyotypes of their own, these in the bone marrow were limited to only a few karyotypes. Anprews, G. A» Diagnosis 4 Organizatior Cronkite, E-P. Ionizing Ra Washingtot Cusxova, A.K Conferenct New York. Hastertik, R. Conferenc New Yor} HEMPELMAN, ~ Medicine IsHIHARA, T- | IsHtHARA, TNorth H IsHiHARA, T242. Janet, H. SPERMATOGENESIS > World AS a generative tissue, spermatogenesis has manysimilarities with hematopoiesis. Therefore, the changes of number of spermatozoa is described for reference. The number of spermatozoa decreased, and minimum numbers were obtained in 16 cases about 8 monthsafter the exposure. Amano, S. (1953) = Gakujutsu S Lowering of mobility Kixucut, T-stitute Kutura, K- Influer the Pr