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DT中性子を用いた高濃度ホウ素含有コンクリートの遮蔽実験,2; DT中性子を用いた遮蔽実験

Shielding experiment for new concrete with high concentration of boron by using DT neutrons, 2; Shielding experiment by using DT neutrons

佐藤 聡; 塩永 亮介*; 野瀬 裕之*; 今野 力  ; 中島 宏

Sato, Satoshi; Shionaga, Ryosuke*; Nose, Hiroyuki*; Konno, Chikara; Nakashima, Hiroshi

開発したホウ素含有コンクリートの中性子遮蔽特性を調べるために、原子力機構FNSのDT中性子源を用いて遮蔽実験を実施した。ホウ素含有コンクリート実験体系の大きさは高さ40cm、幅40cm、厚さ60cmで、DT中性子源から20cmの位置に設置した。実験体系の中心軸上で実験体系表面から深さ5cm毎にニオブ箔と金箔を設置し、$$^{93}$$Nb(n,2n)$$^{92m}$$Nb反応の反応率及び$$^{197}$$Au(n,$$gamma$$)$$^{198}$$Au反応の反応率を測定した。MCNP及びFENDL-2.1を用いて実験を解析した。両反応率とも、計算値は実験値と10%以内で一致した。比較のため、実験体系を普通コンクリートに置き換えた場合の解析も行った。実験体系内深さ50cmの位置で、今回開発したボロン含有コンクリートにおける金の反応率が普通コンクリートの場合の約1/40になり、本ボロン含有コンクリートは低エネルギー中性子束を大きく低減できることを確認した。

In order to study the neutron shielding performance of the new concrete with high concentration of boron, the shielding experiment has been performed by using the DT neutron source at FNS in JAEA. The experimental mockup of the concrete with high concentration of boron was 40 cm in height, 40 cm in width and 60 cm in thickness. The distance between the DT neutron source and the mockup was 20 cm. Niobium and gold foils were inserted every 5 cm in depth along the center of the mockup. Reaction rates were measured on the $$^{93}$$Nb(n,2n)$$^{92m}$$Nb and $$^{197}$$Au(n,gamma)$$^{198}$$Au reactions. A calculation with MCNP and FENDL-2.1 was done for the experiment. The calculation results agreed well with the measured ones in the both reaction rates. Another calculation was also conducted on the condition that the experimental mockup was replaced by the ordinary concrete. The reaction rate of the $$^{197}$$Au(n,gamma)$$^{198}$$Au reaction in the new concrete with high concentration of boron was about 1/40 of that in the ordinary concrete at the position of 50 cm in depth, and it was confirmed that the new concrete with high concentration of boron could reduce the neutron flux of low energy.

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