Abstract
Summary and Conclusions
1. The comparative effect of X-rays and neutrons on the survival of 3 mouse tumors was studied. 2. Both X-ray and neutron irradiation in vitro resulted in delaying the appearance of the tumors—mammary carcinoma being the most affected. 3. Some cases of regressions in the growth of lymphoma were noted after neutron and X-ray irradiation. 4. When the doses at the 50% survival point were compared, the X-ray/neutron ratios of the 3 tumors, lymphoma, mammary carcinoma, and lymphosarcoma, were found to be 5.8, 6.1, and 7.5 respectively. These ratios do not seem to indicate a significant difference in the sensitivity of the tumors to the radiations, but do show that per unit of ionization neutrons are more biologically destructive than X-rays.
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