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広島原爆における速中性子線の評価

An Estimation of the fast-neutron fluence for the Hiroshima atomic bomb

柴田 徳思

Shibata, Tokushi

広島原爆の速中性子束の評価を行った。評価法は、銅試料中に生成される$$^{63}$$Niの量,広島原爆の中性子スペクトル,$$^{63}$$Cu(n,p) $$^{63}$$Ni反応の励起関数を用いて中性子束を求めるものである。銅試料中のごく微量の$$^{63}$$Niを抽出する方法を開発し、低バックグランド液体シンチレーションカウンタで$$^{63}$$Niを測定した。$$^{63}$$Cu(n,p) $$^{63}$$Ni反応の断面積の測定を行い、銅試料中の$$^{63}$$Niの量,中性子スペクトルと励起関数を用いて、速中性子束を求めた。得られた結果は、新しい線量評価システムDS02と矛盾はないことが示された。

An estimation of the fast neutron fluence for the Hiroshima Atomic Bomb was carried out. The method is to estimate the fluence using the amount of the $$^{63}$$Ni contents in copper samples, neutron spectrum for the Hiroshima Atomic Bomb, and the excitation function of the $$^{63}$$Cu(n, p) $$^{63}$$Ni reaction. The extraction method of the trace amount of the $$^{63}$$Ni from copper samples was developed. The $$^{63}$$Ni was measured by a low-background liquid-scintillation counter. The excitation function of the $$^{63}$$Cu(n,p) $$^{63}$$Ni reaction was measured. The fluence was obtained from the measured $$^{63}$$Ni amount using the neutron spectrum and the excitation function of the reaction. The obtained results are consistent with the values given by the new dosimetry system D02.

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