Abstract
Summary
1. Leukemias induced in mice of the RF strain by acute fast neutron irradiation in the cyclotron resembled in frequency and hematologic type those induced by X irradiation. 2. Neutrons and X rays appeared to have an over-all leukemia-inducing effectiveness comparable to their 30-day lethality effectiveness, although thymic lymphomas were significantly less frequent in neutron-exposed than in X-irradiated mice. 3. The induction of thymic lymphomas appeared to be enhanced by fractionation of either neutron or X irradiation at intervals of 5-8 days.
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