Dependence of the incidence of the occurrence of ovarian and uterine tumors in rats on the irradiation dosage from accelerated particles and gamma rays

The incidence rate of ovarian and uterine tumours in rats after irradiation by protons with the energy of 645 MeV, 9 GeV and He2+ has been studied. The tumour rate is shown to increase with the radiation dose. The character of the dose-response for tumours of two sites is different. A relative risk of ovarian tumour incidence after He2+ exposure is twice as high as after other types of radiation.