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Radiation Protection Dosimetry 2005 116(1-4):553-557; doi:10.1093/rpd/nci013
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Arrangement of high-energy neutron irradiation field and shielding experiment using 4 m concrete at KENS

N. Nakao1,7,*, H. Yashima2,8, M. Kawai1, K. Oishi3, H. Nakashima4, K. Masumoto1, H. Matsumura1, S. Sasaki1, M. Numajiri1, T. Sanami1, Q. Wang1, A. Toyoda1, K. Takahashi1, K. Iijima1, K. Eda1, S. Ban1, H. Hirayama1, S. Muto1, T. Nunomiya2, S. Yonai2, D. R. H. Rasolonjatovo2, K. Terunuma2, K. Yamauchi2, P. K. Sarkar1, E. Kim5, T. Nakamura2 and A. Maruhashi6,8

1 High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
2 Tohoku University, Aoba-ku, Sendai, Miyagi 980-8579, Japan
3 Institute of Technology, Shimizu Corporation, Koto-ku, Tokyo 135-8530, Japan
4 Japan Atomic Energy Research Institute (JAERI), Tokai-mura, Ibaraki 319-1195, Japan
5 National Institute of Radiological Sciences (NIRS), Chiba 263-8555, Japan
6 Proton Medical Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
7 Present address: Stanford Linear Accelerator Center (SLAC), Stanford University, Stanford, CA 94309, USA
8 Present address: Kyoto University Research Reactor Institute (KURRI), Osaka, Japan

* Corresponding author: noriaki.nakao{at}kek.jp

An irradiation field of high-energy neutrons produced in the forward direction from a thick tungsten target bombarded by 500 MeV protons was arranged at the KENS spallation neutron source facility. In this facility, shielding experiment was performed with an ordinary concrete shield of 4 m thickness assembled in the irradiation room, 2.5 m downstream from the target centre. Activation detectors of bismuth, aluminium, indium and gold were inserted into eight slots inside the shield and attenuations of neutron reaction rates were obtained by measurements of gamma-rays from the activation detectors. A MARS14 Monte Carlo simulation was also performed down to thermal energy, and comparisons between the calculations and measurements show agreements within a factor of 3. This neutron field is useful for studies of shielding, activation and radiation damage of materials for high-energy neutrons, and experimental data are useful to check the accuracies of the transmission and activation calculation codes.


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H. Matsumura, K. Masumoto, N. Nakao, Q. Wang, A. Toyoda, M. Kawai, T. Aze, and M. Fujimura
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