A comparative study was made of the radiobiological aftereffects of the action of fast neutrons and gamma-rays on lymphoid tissues of rat thymus with a reference to a biochemical criterion of the interphase death of lymphocytes, i.e. the formation of polydeoxynucleotides (PDN). It was shown that the increase in the chromatin degradation was a function of dose of neutron- and gamma-radiation (up to 4 Gy). The dynamics of the PDN formation was similar with both types of radiation, but 4-6 h after neutron irradiation chromatin degradation was higher more pronounced. The RBE of neutrons varied from 3 to 2 with a radiation dose varying from 0.25 to 4 Gy.
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