The neutron component of background of an HPGe detector operating in a surface laboratory

被引：9

作者：

Baginova, M. ^{[1
,2
]}

Vojtyla, P. ^{[1
]}

Povinec, P. P. ^{[2
]}

机构：

[1] CERN, CH-1211 Geneva, Switzerland

[2] Comenius Univ, Fac Math Phys & Informat, Bratislava 84248, Slovakia

来源：

APPLIED RADIATION AND ISOTOPES | 2020年 / 166卷

关键词：

Monte Carlo simulation; Neutron induced background; GEANT4; High-purity Ge detector;

D O I：

10.1016/j.apradiso.2020.109422

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Investigation of neutron-induced background was carried out by studying interactions of cosmic-ray neutrons with an HPGe detector inside its shield placed on a ground floor of a 3-storey building. The study was conducted experimentally and by Monte Carlo simulations using GEANT4 simulation tool. Detailed analysis of measured background gamma-ray spectra showed that many gamma-lines visible in the spectra were induced by neutrons. The majority of detected gamma-rays originated in germanium, copper, lead and tin. Iron and aluminium components were less important background sources. Inelastic scattering and neutron capture were the most often occurring processes of neutron interactions with the detector and its shielding. The contamination by natural radionuclides, specifically of K-40, Pb-214, Bi-214 and Tl-208, was also present in the background spectra. Nevertheless, approximately 35% of Tl-208 peak at the energy of 2614.51 keV was produced by inelastic scattering of neutrons on Pb-208 nuclei. The experimental background was compared with GEANT4 simulations, which were carried out without and with the shielding layer of the building. The final integral counting rates for measured spectrum in the energy range from 50 keV to 2875 keV was 1.26 +/- 0.07 s(-1) and for simulated one 1.25 +/- 0.13 s(-1), indicating very good agreement with the experiment.

引用

页数：15

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