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Matsuda, Norihiro; Nakashima, Hiroshi; Kasugai, Yoshimi; Sasamoto, Nobuo*; Kinno, Masaharu*; Kitami, Takayuki; Ichimura, Takahito; Hori, Junichi*; Ochiai, Kentaro; Nishitani, Takeo
Journal of Nuclear Science and Technology, 41(Suppl.4), p.74 - 77, 2004/03
In high power proton accelerator facilities, concrete shield can be highly activated, which makes maintenance work quite difficult. So, a low-activationized concrete (limestone concrete) is to be partially adopted as a concrete shield for Japan Proton Accelerator Research Complex (J-PARC) aiming at reducing 
-ray exposure dose during maintenance period. A new quantity, 
Na-equivalent, was introduced as a criterion to assure effectiveness of the low-activationized concrete. In order of its verification, powdered low-activationized concrete and ordinary one were irradiated using FNS at JAERI. The measurements were analyzed by a shielding design code system being used for J-PARC, showing that the calculations reproduce the measured induced activity within a factor of 2. Furthermore, by using the same code system, -ray exposure dose was calculated for the configuration of J-PARC to find out that -ray exposure dose by the low-activationized concrete was about 10 times lower than that by the ordinary concrete in a period of less than a few days after operation.
Meigo, Shinichiro; Nakashima, Hiroshi; Takada, Hiroshi; Kasugai, Yoshimi; Ino, Takashi*; Maekawa, Fujio; Hastings, J.*; Watanabe, Noboru; Oyama, Yukio; Ikeda, Yujiro
JAERI-Data/Code 2001-014, 23 Pages, 2001/03
JAERI-Data-Code-2001-014.pdf:1.55MB
no abstracts in English
Hatsukawa, Yuichi; Hayakawa, Takehito; Toh, Yosuke; Shinohara, Nobuo; Oshima, Masumi
CP495, Experimental Nuclear Physics in Europe, p.429 - 430, 1999/11
no abstracts in English
Nakashima, Hiroshi; Takada, Hiroshi; Meigo, Shinichiro; Kasugai, Yoshimi; Ikeda, Yujiro; Oyama, Yukio; Watanabe, Noboru*;
Proc. of 14th Meeting of the Int. Collaboration on Advanced Neutron Sources (ICANS-14), 1, p.457 - 467, 1998/11
no abstracts in English
Takada, Hiroshi; Meigo, Shinichiro; Sasa, Toshinobu; Fukahori, Tokio; V.I.Belyakov-Bodin*; G.I.Krupny*; Yu.E.Titarenko*
Proc. of 4th Int. Information Exchange Meeting on Actinide and Fission Product Partitioning and Transm, 0, p.323 - 333, 1997/00
no abstracts in English
