Determination of the gamma-ray spectrum in a strong neutron/gamma-ray mixed field

被引：4

作者：

Liu, Yuan-Hao ^{[1
]}

Lin, Yi-Chun ^{[2
]}

Nievaart, Sander ^{[3
]}

Chou, Wen-Tsae ^{[2
]}

Liu, Hong-Ming ^{[1
]}

Jiang, Shiang-Huei ^{[4
]}

机构：

[1] Natl Tsing Hua Univ, Nucl Sci & Technol Dev Ctr, Hsinchu 30013, Taiwan

[2] Natl Tsing Hua Univ, Dept Biomed Engn & Environm Sci, Hsinchu 30013, Taiwan

[3] European Commiss, Inst Energy, Joint Res Ctr, Petten, Netherlands

[4] Natl Tsing Hua Univ, Inst Nucl Engn & Sci, Hsinchu 30013, Taiwan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2011年 / 652卷 / 01期

关键词：

Mg(Ar) ionization chamber; Spectrum unfolding; Gamma-ray spectrum; Epithermal neutron beam; BNCT; BEAM; BNCT; DOSIMETERS; MODEL; HFR;

D O I：

10.1016/j.nima.2010.11.184

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The knowledge of gamma-ray spectrum highly affects the accuracy of the correspondingly derived gamma-ray dose and the correctness of calculated neutron dose in the neutron/gamma-ray mixed field dosimetry when using the paired ionization chambers technique. It is of our interest to develop a method to determine the gamma-ray spectrum in a strong neutron/gamma-ray mixed field. The current type detector, Mg(Ar) ionization chamber with 6 different thick caps incorporated with the unfolding technique, was used to determine the gamma-ray spectrum in the THOR epithermal neutron beam, which contains intense neutrons and gamma rays. The applied caps had nominal thicknesses from 1 to 6 mm. Detector response functions of the applied Mg(Ar) chamber with different caps were calculated using MCNP5 with a validated chamber model. The spectrum unfolding process was performed using the well-known SAND-II algorithm. The unfolded result was found much softer than the originally calculated spectrum at the design stage. A large portion of low energy continuum was shown in the adjusted spectrum. This work gave us a much deeper insight into the THOR epithermal neutron beam and also showed a way to determine the gamma-ray spectrum. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：554 / 558

页数：5

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