After double partial X irradiation of abdomen the postirradiation radiosensitivity of mongrel male rats was studied by the criterion of a median lethal dose; clinical and laboratory parameters were investigated after preirradiation with 4.6 and 8 Gy. A function is proposed linking the dynamics of the postirradiation radiosensitivity of rats with the proliferative activity of small intestine and its total cellularity.
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