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Radiation Protection Dosimetry 2005 116(1-4):1-5; doi:10.1093/rpd/nci012
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Characteristics of high-energy neutrons estimated using the radioactive spallation products of Au at the 500-MeV neutron irradiation facility of KENS

Hiroshi Matsumura1,*, Kazuyoshi Masumoto1, Noriaki Nakao1, Qingbin Wang1, Akihiro Toyoda1, Masayoshi Kawai1, Takahiro Aze2 and Masatsugu Fujimura2

1 High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
2 Graduate School of Integrated Basic Sciences, Nihon University, Setagaya-ku, Tokyo 156-8550, Japan

* Corresponding author: hiroshi.matsumura{at}kek.jp

We carried out a shielding experiment of high-energy neutrons, generated from a tungsten target bombarded with primary 500-MeV protons at KENS, which penetrated through a concrete shield in the zero-degree direction. We propose a new method to evaluate the spectra of high-energy neutrons ranging from 8 to 500 MeV. Au foils were set in a concrete shield, and the reaction rates for 13 radionuclides produced by the spallation reactions on the Au targets were measured by radiochemical techniques. The experimental results were compared with those obtained by the MARS14 Monte-Carlo code. A good agreement (between them) was found for energies beyond 100 MeV. The profile of the neutron spectrum, ranging from 8 to 500 MeV, does not depend on the thickness of the concrete shield.


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Radiat Prot Dosimetry, December 20, 2005; 116(1-4): 553 - 557.
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