Low-level single and coincidence gamma-ray spectrometry |
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Authors: | I Sýkora M Je?kovský R Janik K Holý M Chudý P P Povinec |
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Institution: | (1) Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina F1, SK-842 48 Bratislava, Slovakia |
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Abstract: | Analyses of anthropogenic and natural gamma-ray emitters in the environment require high sensitive detector systems operating
in coincidence-anticoincidence modes. Thanks to an excellent energy resolution and a high efficiency, large volume HPGe detectors
have been widely used in low-level gamma-ray spectrometry. In the present paper we discuss the characteristics of single and
coincidence (HPGe-NaI(Tl)) arrangements suitable for analysis of environmental samples containing cascade gamma-ray emitters
(e.g., 60Co), positron emitters (e.g., 22Na) and single gamma-ray emitters (e.g., 137Cs). The detectors were placed in a large volume shields consisting of iron, lead and copper layers. The reduction of background
for the single gamma-ray spectrometer is between 60 and 250, depending on the gamma-ray energy. As an improvement of the apparatus,
low detection limits for analysis of 137Cs (0.3 Bq·kg−1) and 60Co (0.1 Bq·kg−1) in environmental samples, respectively, have been obtained. |
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