[Changes in the radiosensitivity of cortical thymocytes during differentiation]

To determine the radiosensitivity of cortical thymocytes at different stages of their differentiation, that took three days, estimated was the part of DNA of labelled thymocytes within the salt soluble fragments of the chromatin formed 6 h after irradiation of rats at different times during three days following the initial labelling of thymic blast DNA. The radiosensitivity of cells, which were at the terminal stages of differentiation, was twice as high as that of lymphocytes which were at the initial stage of differentiation.