Cytogenetic research on micropopulations of the root vole (Microtus oeconomus Pall.) living under various radioecological habitat conditions

Percentage of aneuploid cells and that of cell with chromosome aberrations in Microtus oeconomus Pall. living in areas with the enhanced radiation background (the dose of external radiation is 50 times and that of internal irradiation of bone marrow by incorporated 226Ra 10 times higher than the controls) exceeds significantly (p less than 0.05) the control values. It is concluded that mutations occur in the experimental animals more frequently than in the controls.