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加速器施設における放射線管理,1; J-PARCにおける放射線安全対策とその管理

Radiation control for accelerator facility, 1; Radiation safety and management at J-PARC

中島 宏; 宮本 幸博  

Nakashima, Hiroshi; Miyamoto, Yukihiro

J-PARC(大強度陽子加速器施設)は、世界最大級のビーム強度を有する高エネルギー加速器施設である。J-PARCは大強度・高エネルギーであるため、放射線安全の観点から、さまざまな解決すべき問題を有しており、設計・建設段階からさまざまな対策が検討された。また、本施設の円滑で効率的な施設運用を考慮し、本施設の運転・管理・利用方法等を想定して、安全上の対策を行った。本論文では、本施設の放射線安全対策の中から、放射線遮蔽設計にかかる条件設定と手法,空気・水などの放射化物の取り扱い,放射化した機器の保守及び放射線モニタ設備について解説した。

J-PARC (Japan Proton Accelerator Research Complex) is a high energy accelerator facility with the world-top-class high beam intensity. Because J-PARC has high intensity and high energy, from the viewpoint of radiation safety, J-PARC has various problems that should have been examined and overcome at the stage of design and construction. In addition, aiming at smooth and effective operation of the facility, I assumed operation pattern, management and the usage of the facility and designed some building and tunnel settled accelerators as well as some instruments to keep radiation safety. In this paper, I explained, from the various countermeasures, radiation shielding design condition and methods, handling of activated air and water in the instruments and the facility, maintenance of the activated accelerators and targets, and a radiation monitoring system.

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