Spermatogenesis of Rats Injected with Radioactive Cesium 137

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Solution of radioactive cesium, ^<137>Cs, was injected to rats intraperitoneally, and the quantitative examination was made on its spermatogenesis. For making calculation simply and getting conclusion clearly, Germ Cell Tubulus Ratio or shortly Germ Cell Ratio method was used. Germ Cell Ratio is the proportion of the seminiferous tubules having spermatogonia, spermatocytes, spermatids and sperm cells to all seminiferous tubules on the same section of the testis. After the administration of 5, 50, and 200 micro-curies of ^<137>Cs animals were sacrified with elapsed time. The germ cell ratio of each type of germ cells appeared significantly decreased, particularly in the 200-micro-curies-injected group. Even in the 5-micro-curies-injected animals, diminution of the germ cell ratio of each type of germ cells was slight but statistically significant with exception of the sperm cells which kept the stationary level of about 90 to 100 per cent throughout observation. According to our estimation, the animals in this 5-micro-curies-group received radiation dose of only less than 10 rad by internally administered ^<137>Cs.
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