Validity of the Four-Parameter Empirical Formula in Approximating the Response Functions for Gamma-ray, Neutron, and Secondary Gamma-ray Skyshine Analyses
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概要
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A four-parameter approximating formula, R=Aeaxbf(x), accurately represents the skyshine line beam response function (LBRF) as a function of the distance (x) of the source-to-detector separation. Here, A is a constant for a given source energy and f(x)=ecxxdx is a damping factor. The four parameters are obtained as follows.(1) The value of parameter a corresponds to that of the LBRF at x=1 meter, which is the result of integrating the basic dose spectrum due to a single scattering particle from an emitted beam for a specified angle and a specified source energy.(2) The value of parameter b corresponds to the slope of a straight line of the response function, logR vs. logx, in the range of small distance from a source, where a single scattering particle dominates.(3) The damping factor (f(x)) represents the attenuation trend of the LBRF at distances far from the source; the values of parameters c and d control the quantity of attenuation.The necessary reference LBRF data for point mono-directional photon source energies ranging from 0.1 to 10 MeV were generated using the EGS4 Monte Carlo code at 20 emission angles from 0.0 to 180° for 24 source-detector distances up to 2,000 m. The validity of using the four-parameter formula to interpolate the LBRF in the source-to-detector distance, in the emitted angle, and in the energy was also ascertained. Furthermore, this formula was applied to the skyshine conical beam response function (CBRF) for a neutron and an associated secondary gamma-ray with the source energy ranged from thermal to 3 GeV. It was ascertained that the CBRF could be accurately approximated by an interpolation of the fitting parameters at an arbitrary distance and emitted cosine angle.
- 一般社団法人 日本原子力学会の論文
- 2003-08-25
著者
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SAKAMOTO Yukio
Japan Atomic Energy Research Institute
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KUROSAWA Naohiro
Visible Information Center
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NAKASHIMA Hiroshi
Japan Atomic Energy Research Institute
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Hirayama Hideo
High Energy Accelerator Research Organization
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Tayama Ryuichi
Nuclear Systems Division Hitachi Ltd.
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Hayashi Katsumi
Nuclear Systems Division Hitachi Ltd.
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HARIMA Yoshiko
CRC Solutions Corporation
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SASAMOTO Nobuo
Japan Atomic Energy Research Institute
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MASUKAWA Fumihiro
Japan Atomic Energy Research Institute
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HANDA Hiroyuki
Nuclear Systems Division, Hitachi, Ltd.
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NEMOTO Makoto
Visible Information Center Inc.
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ABE Teruo
Startcom, Ltd.
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Kurosawa Naohiro
Visible Information Center Inc.
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Abe Teruo
Startcom Ltd.
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Handa Hiroyuki
Nuclear Systems Division Hitachi Ltd.
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Nakashima H
Japan Atomic Energy Research Institute
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