Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 68(8): 559-565 (2019)

特集Special Issues

7.2.3 重イオン生成中性子の物質透過の実験7.2.3 Measurements of Heavy-ion Produced Neutrons Penetrated through Shields

東北大学名誉教授Tohoku University, Professor Emeritus ◇ 980–8578 仙台市青葉区荒巻字青葉6–3 ◇ 6–3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, 980–8578, Japan

発行日:2019年8月15日Published: August 15, 2019

100 MeVを超える中性子まで測定できる検出器として,大型有機液体シンチレータや自己TOF測定器を開発し,さらにBiとCの核破砕検出器やTEPC(組織等価比例計数管)も用いて,重イオン生成中性子の鉄とコンクリートの遮蔽体透過実験を行った。400 MeV/核子の炭素イオンを厚い銅ターゲットに入射し,前方に発生した中性子が様々な厚さの鉄とコンクリートを透過した後の中性子スペクトルを測定した。実験値は計算値と比較した。この結果は高エネルギー重イオン加速器遮蔽の世界で唯一の実験データとして貴重であり,OECD/NEAの遮蔽ベンチマーク実験のデータベース(SINBAD)にも登録されている。

For measuring neutrons of over 100 MeV energy, large-scale liquid organic scintillators and self-TOF detectors were developed. Together, by using spallation detectors of Bi and C and TEPC (Tissue Equivalent Proportional Counter), neutron shielding experiment was conducted behind concrete and iron shields. A C ion beam of 400 MeV/nucleon was stopped in a thick Cu target, and secondary neutrons produced in the forward direction penetrated through iron or concrete shields of various thicknesses. The neutron energy spectra behind the shields were measured and compared with calculations. This is only set of unique experimental data concerning neutron shielding using a high-energy heavy-ion facility, and is registered in the SINBAD (Shielding Benchmark Experiments) database of OECD/NEA.

Key words: HIMAC (Heavy Ion Medical Accelerator in Chiba); neutron detectors; response function; iron; concrete; neutron spectra penetrated through shield

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