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Radiation Protection Dosimetry 2005 116(1-4):653-657; doi:10.1093/rpd/nci241
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Angular distribution measurements of photo-neutron yields produced by 2.0 GeV electrons incident on thick targets

Hee-Seock Lee1,*, Syuichi Ban2, Toshiya Sanami2, Kazutoshi Takahashi2, Tatsuhiko Sato3, Kazuo Shin4 and Chinwha Chung1

1 Pohang Accelerator Laboratory, POSTECH, Nam-gu, Pohang 790-784, South Korea
2 High Energy Accelerator Research Organization, Oho, Tsukuba, Ibaraki 305-0801, Japan
3 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
4 Department of Nuclear Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan

* Corresponding author: lee{at}postech.ac.kr

A study of differential photo-neutron yields by irradiation with 2 GeV electrons has been carried out. In this extension of a previous study in which measurements were made at an angle of 90° relative to incident electrons, the differential photo-neutron yield was obtained at two other angles, 48° and 140°, to study its angular characteristics. Photo-neutron spectra were measured using a pulsed beam time-of-flight method and a BC418 plastic scintillator. The reliable range of neutron energy measurement was 8–250 MeV. The neutron spectra were measured for 10 Xo-thick Cu, Sn, W and Pb targets. The angular distribution characteristics, together with the previous results for 90°, are presented in the study. The experimental results are compared with Monte Carlo calculation results. The yields predicted by MCNPX 2.5 tend to underestimate the measured ones. The same trend holds for the comparison results using the EGS4 and PICA3 codes.


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