The Effects of 14.1 MeV Neutron Irradiation on the Hematopoletic Organs of Rats

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For the purpose of observing the effects of fast neutron irradiation on the hematopoietic organs of rats, Wistar rats were administered a single exposure of 500 rads and 400 rads of 14.1 MeV neutron irradiation and repeated exposures of 200 rads of neutron irradiation. These results were compared to those given by the same absorbed dose of 180 kVP X-ray and ^<60>Co gamma ray irradiation. The effects of fast neutron irradiation on the hematopoietic organs of rats showed no remarkable difference from those in mice, but they were stronger than those following X-ray irradiation and gamma ray irradiation. The bone marrow of rats exposed to neutron irradiation showed a picture of characteristic damage and regeneration as in the case of mice. Though a remarkable damage to the bone marrow was observed in animals given repeated neutron irradiations, there was no animal which experienced acute death. This is considered to be due to the absence of ulceration in the intestinal mucosa. The RBE of 14.1 MeV neutron for the 50% decrease in thymus weight of rats was approximately 1.2 against 180 kVP X-ray and approximately 1.4 against ^<60>Co gamma ray.
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