Laboratory male mice (CBA X C57Bl)F1 were exposed in three sectors with different contamination degree of radionuclides within 30 km-zone of the Chernobyl Atomic Power Plant. The total absorbed radiation doses in testes were 0.1; 3 and 25 Gy, respectively. Great depression of spermatogenesis was observed in exposed mice up to complete sterility in males from the most contaminated sector. The mutagenic effect of radiation was relatively low and did not increase with growth of the contamination degree.
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