Background radiation reduction for a high-resolution gamma-ray spectrometer used for environmental radioactivity measurements

被引：18
作者：
Radulescu, I. [1 ]
Blebea-Apostu, A. M. [1 ]
Margineanu, R. M. [1 ]
Mocanu, N. [1 ]
机构：
[1] Horia Hulubei Natl Inst Phys & Nucl Engn IFIN HH, Dept Life & Environm Phys, RO-077125 Magurele, Romania
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2013年 / 715卷
关键词：
Gamma-ray spectrometry; Minimum detectable Activity; Low-background; Copper lining; ACTIVATION-ANALYSIS; SPECTRUM; SAMPLES; SYSTEM;
D O I：
10.1016/j.nima.2013.03.024
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
A detailed analysis is presented of background radiation spectra for a high-resolution gamma-ray spectrometer used to measure environmental radioactivity, for various shielding configurations. The main goal is to improve the detection limits of low-level activity measurements by reducing the background as much as possible. Passive shielding configurations are used to decrease the total background counting rate by adding new layers. Subsequently, for the maximum shielding configuration, the Minimum Detectable Activity (MDA) is improved by at least 13-fold for Cs-137, 8-fold for Bi-214 (609.31 keV), 7-fold for K-40 and 5.5-fold for Tl-208 (2614.53 keV). A reduction factor of 240 for the Cs-137 peak (counting rate) at maximum shielding and an insignificant peak for this radionuclide was determined. For other radionuclides, peaks below the detection limit of the detector system were also found. These results show that the shielding was successful in reducing and removing peaks from the background spectrum. (c) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：112 / 118
页数：7
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