The resistance of mice to whole-body irradiation with lethal doses, after preirradiation of part of the abdomen, was studied with a reference to radiation dose, the volume of local exposure, and the interval between exposures. The radioresistance was found to increase when the preirradiated zone corresponded to the spleen projection, the interval between exposures was 3-7 days, and the dose of local exposure, 2 Gy.
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