[Mutagenic action of tritium on the germ cells of male mice. II. The genetic damages in stem spermatogonia induced by tritium oxide and gamma radiation].

The frequency of reciprocal translocations (RT) induced by single injection of tritiated water (THO) (3.3; 6.3 and 12.6 MBq/g) or by referent 137Cs gamma irradiation was studied. The absorbed doses in testis were: 1; 2 and 4 Gr. The frequency of RT per 100 cells were 0.4; 1.1 and 2.5 after THO administration, and 0,5; 0.9 and 1.2 after single exposure to gamma irradiation, respectively. The RBE of tritium increased from 1 at the dose of 1 Gr to 2, at the dose of 4 Gr.