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The human lymphocyte as a radiobiological dosimeter after total body irradiation.

Lymphocytes from seven patients receiving 100 or 200 rads of cobalt-60 total body irradiation for therapy of metastatic tumors have been cultured with phytohemagglutinin, harvested at 48 hr, and examined for the incidence of chromosome aberrations. The mean yield of dicentric plus ring forms per cell were found to be 0.043 at 100 rads and 0.098 at 200 rads. These were compared to the only other human data available for homogeneous total body irradiation, that of Buckton et al. who employed doses of 25-50 rads. By a one-way analysis of variance there is no significant difference between the dicentric plus ring yield per cell for the available data at 25, 50, 100, or 200 rads. Individual variation in response to a homogeneous dose of total body irradiation may diminish the value of lymphocyte chromosome aberrations as a radiation dosimeter.