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
HIMAC施設の建設が1984年に決まり，放射線遮蔽安全設計を全面的に依頼された。当時，重イオン輸送計算コードはなく，ともかく安全側の評価をしたが，その時の苦労が，その後の重イオン輸送計算コードPHITSの開発等の研究の発展につながった。HIMAC施設が完成後，それまでほとんどなかった重イオンによる2次粒子，特に安全設計上重要な中性子生成の実験データを系統的に取得した。これらの成果は，世界中の重イオン加速器施設の設計にも広く利用されている。
It was decided to construct the HIMAC facility in 1984, and the author was asked to be a responsible person on the radiation shielding safety design. The design was done from a quite safe perspective since there were no heavy ion transport codes and no experimental data at that time in the world. This effort eventually led to the development of the heavy ion transport Monte Carlo code, PHITS and many other experimental works. After completing the HIMAC facility, the experimental data on secondary particle production, especially neutron production, which is essentially important for shielding design, from heavy ion injection have been measured systematically. These experimental results have been widely used for designing the shielding of heavy ion accelerator facilities around the world.
Key words: HIMAC (Heavy Ion Medical Accelerator in Chiba); radiation shielding safety design; heavy ion transport calculation code; double-differential neutron production cross section (DDX); thick target neutron production yield (TTY); neutron transport through shield; spallation products by heavy ions
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