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

Norikazu KinoshitaHigh Energy Accelerator Research Organization, 1-1 Oho, Tsukuba Ibaraki 305-0801, Japan

Hiroshi MatsumuraHigh Energy Accelerator Research Organization, 1-1 Oho, Tsukuba Ibaraki 305-0801, Japan

Kotaro BesshoHigh Energy Accelerator Research Organization, 1-1 Oho, Tsukuba Ibaraki 305-0801, Japan

Akihiro ToyodaHigh Energy Accelerator Research Organization, 1-1 Oho, Tsukuba Ibaraki 305-0801, Japan

Kazuyoshi MasumotoHigh Energy Accelerator Research Organization, 1-1 Oho, Tsukuba Ibaraki 305-0801, Japan

Yuki MatsushiUniversity of Tokyo, Micro Analysis Laboratory, Tandem Accelerator, Department of Nuclear Engineering and Management 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan

Kimikazu SasaUniversity of Tsukuba, Tandem Accelerator Complex 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan

Tsutomu TakahashiUniversity of Tsukuba, Tandem Accelerator Complex 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan

Shozo MiharaUniversity of Tsukuba, Tandem Accelerator Complex 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan

Toshiyuki OkiUniversity of Tsukuba, Tandem Accelerator Complex 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan

Masumi MatsumuraUniversity of Tsukuba, Tandem Accelerator Complex 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan

Yuki TosakiUniversity of Tsukuba, Tandem Accelerator Complex 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan

Keisuke SuekiUniversity of Tsukuba, Tandem Accelerator Complex 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan

Michiko TamariUniversity of Tsukuba, Tandem Accelerator Complex 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan

Yasuo NagashimaUniversity of Tsukuba, Tandem Accelerator Complex 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan

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Abstract

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

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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

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