Effects of Thermal Neutrons on Living Cells III. Estimation of Absorbed Dose in Amoeba lrradiated by Thermal Neutrons

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An absorbed dose in amoeba irradiated by thermal neutrons was estimated. Nuclear events following to thermal neutron capture were divided into 6 parts. More than 99% of absorbed dose was estimated to be due to capture γ-rays. Absorbed dose due to recoil nucleus following to the emission of capture γ-rays and that due to β- or γ-rays emitted at the nuclear disintegration of newly formed radioactive nuclides were about 1/1000 of that of capture γ-rays. Anyhow, the absorbed dose obtained by these calculation is too small to explain the lethal effects of thermal neutrons on amoeba. Therefore another processes than energy absorption, namely, transmutation effects due to thermal neutron capture and nuclear disintegration must be taken into account. Especially, the bond rupture on thermal neutron-irradiated DNA, caused by the nuclear reaction ^<31>P(n, γ) ^<32>P, would play a very important role in cell killing of amoebae. It is of importance to examine relative biological effectiveness an relatrve energy transfer of neutrons as a function of their energy. However, there have been only a few studies dealing with those for thermal neutrons. In the previous paper, we suggested that the lethal actions of thermal neutrons on amoebae must anse by the nuclear reactron, namely, ^<31>P(n, γ)^<32>P on DNA chain. This is based on the following experimental facts : 1) D_0 against ^<60>Co-γ-rays was 2.5・10^5 rad while it was 9.1・10^13 n. cm^<-2> for thermal neutrons. This dose of thermal neutrons is known to be about 2.5・10^3 rad, by employing the coefficient given by ICRU.
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Effects of Thermal Neutrons on Living Cells III. Estimation of Absorbed Dose in Amoeba lrradiated by Thermal Neutrons

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