Effect of (.GAMMA.,n) reactions of heavy water moderator on beam quality in biomedical irradiation facility.
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概要
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The effect of (γ, <I>n</I>) reactions of heavy water on beam quality of a biomedical irradiation facility was studied. In an irradiation facility using thermal neutrons from a nuclear reactor, heavy water is widely employed as neutron moderator because of its good nuclear charac-teristics. It is well known that the threshold energy of (γ, <I>n</I>) reactions of heavy water is 2.2 MeV and fast neutrons are generated from the reactions. In 1982, we proposed a tech-nique for the evaluation of (γ, <I>n</I>) reactions using a computer code ANISN-JR. In the present work, with further improved ANISN-JR for the proper estimation of the leakage, the com-parison calculations both with and without (γ, <I>n</I>) reactions were carried out and their results were compared with those of the foil activation experiments at the KUR Heavy Water Facility. In the ignorance of (γ, <I>n</I>) reactions, fast and epithermal neutron fluxes are extremely underestimated for deeper penetration than 80 cm, while the calculated results including (γ, <I>n</I>) reactions give good agreements with experiments.
- 一般社団法人 日本原子力学会の論文
著者
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KANDA Keiji
Research Reactor Institute, Kyoto University
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KANDA Keiji
Research Laboratory of Nuclear Reactor, Tokyo Institute of Technology
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AOKI Kazuhiko
Research Reactor Institute, Kyoto University
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