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Depth Profile of Radioactivity Induced in the Thick Concrete Shield in EP1 Beam Line at the KEK 12-GeV Proton Synchrotron Facility

Norikazu Kinoshita, Hiroshi Matsumura, Kotaro Bessho, Akihiro Toyoda, Kazuyoshi Masumoto, Yuki Matsushi, Kimikazu Sasa, Tsutomu Takahashi, Shozo Mihara, Toshiyuki Oki, Masumi Matsumura, Yuki Tosaki, Keisuke Sueki, Michiko Tamari, Yasuo Nagashima

Nuclear Technology / Volume 168 / Number 3 / Pages 694-699

December 2009

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The evaluation of radioactivity induced in the concrete shield is important for the decommissioning of accelerator facilities. Specific activities of gamma-ray emitters of nuclear spallation products and thermal neutron capture products and beta-ray emitters such as tritium and 14C, and 36Cl in the concrete shield along the 12-GeV proton beam line (EP1 beam line, High Energy Accelerator Research Organization) were determined. The depth profiles of the radioactivity of each nuclide in the 6-m-thick concrete shield of the beam lines were compared, and the secondary particles and induced nuclear reactions were discussed.

 
 
 
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