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Development of neutron measurement in intense $$gamma$$ field using new type of nuclear emulsion

新型原子核乾板を用いた高$$gamma$$線バックグラウンド下での中性子測定手法の開発

河原林 順*; 石原 康平*; 高木 恵輔*; 富田 英生*; 井口 哲夫*; 中 竜大*; 森島 邦博*; 前田 茂貴

Kawarabayashi, Jun*; Ishihara, Kohei*; Takagi, Keisuke*; Tomita, Hideki*; Iguchi, Tetsuo*; Naka, Tatsuhiro*; Morishima, Kunihiro*; Maeda, Shigetaka

新しい原子核乾板法を用いた高$$gamma$$線下での中性子測定法の開発を行っている。中性子照射実験により新型原子核乾板の検出感度曲線(阻止能-銀粒子密度の関係)を求め、その検出感度曲線を用いてモンテカルロシミュレーションによる$$gamma$$線飛跡シミュレーションを行った。さらに、$$gamma$$線照射実験によりシミュレーションの妥当性を評価した。銀粒子径を60$$mu$$mにすることで、中性子と$$gamma$$線の感度比が向上し、中性子エネルギースペクトル測定が可能となる見通しを得た。

In order to measure the neutron from a spent fuel assembly in fast breeder reactor precisely, we made new nuclear emulsion based on non-sensitized OPERA film with AgBr grain size of 60, 90 and 160 nm. The efficiency for $$^{252}$$Cf neutron of the new emulsion was calculated to be 0.7$$times$$10$$^{-4}$$ which energy ranged from 0.3 to 2 MeV that agrees with preliminary estimated value from experimental results. The sensitivity of the new emulsion was also estimated experimentally by irradiating 565 KeV and 14 MeV neutrons and found that the emulsion with the AgBr grain size of 60 nm showed the lowest sensitivity among these three emulsions but still had enough sensitivity for proton. Also, there was a suggestion from the experimental data that there was a threshold LET of 15 KeV/$$mu$$m for our new emulsion below which no silver cluster was developed. Further development of the response of nuclear emulsion with a few tens of nano-meter AgBr size is next step of this study.

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