Abstract
The RBE for 125I relative to 30 keV X-rays, 4 MeV X-rays and 137Cs gamma rays was determined using the induction of micronuclei in human lymphocytes as the biological test system. The 125I photons were as effective as the 30 keV X-rays. If a micronuclei count of 50 per 1500 cells is used as the endpoint, the RBE for 125I was found to be about 1.8 and 1.6 when 4 MeV X-rays and 137Cs gamma rays were used as the reference radiation, respectively.
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