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  • 1 University of Tokyo Graduate School of Science Bunkyo-ku Tokyo 113-0033 Japan
  • | 2 Nihon University Graduate School of Integrated Basic Sciences Setagaya-ku Tokyo 156-8550 Japan
  • | 3 High Energy Accelerator Research Organization (KEK) Tsukuba, Ibaraki 305-0801 Japan
  • | 4 University of Tokyo Micro Analysis Laboratory, Tandem accelerator (MALT) Bunkyo-ku Tokyo 113-0033 Japan
  • | 5 Nihon University College of Humanities and Sciences Setagaya-ku Tokyo 156-8550 Japan
  • | 6 Fermilab Batavia IL USA
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In order to estimate the total radioactivity induced in a concrete shield by thermal neutron-capture reactions at high-energy accelerator facilities, the observed activity of 36Cl in the concrete is expected to serve as an indicator of the thermal neutron fluence. Since 36Cl can also be produced from K and Ca by spallation reactions, we measured these production rates in order to clarify the contribution of each reaction. The Cl, K, and Ca targets were irradiated with neutrons having a maximum energy of 500 MeV. As a result, the production rates of 36Cl from Cl were only two orders higher than those from K and Ca. It was found that the 36Cl production ratios from Cl, K, and Ca were 6.7%, 6.8%, and 86.5%, respectively, and Ca was the main source of 36Cl production.

Manuscript Submission: HERE

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
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Founder Akadémiai Kiadó
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)