Establishment of dose-response relationships between doses of Cs-137 gamma-rays and frequencies of micronuclei in human peripheral blood lymphocytes.

It has been suggested that the yield of micronuclei in human peripheral blood lymphocytes could be used as a biological dosimeter in cases of radiation exposure. In the present study micronuclei were induced in lymphocytes by exposing human blood samples in vitro to various doses of Cs-137 gamma-rays. The blood samples were then cultivated using the cytokinesis block method. Coded programs were employed to establish the relationships between the frequencies of micronuclei and various doses of gamma-rays. The best fit was obtained by the linear-quadratic model, Y = c + aD + bd2, where Y is the yield of micronuclei, D is the dose in Gy and c, a, b, are constants. It seems there is a correlation between the yields of MN in mononuclear cells and the corresponding doses of radiation. Therefore an attempt was made to include these MN in the calculation of the dose-response relationship.