A Low Background Gamma Ray Spectrometer with Anticosmic Shielding

Nguyen Quoc Hung, Vo Hong Hai, Tran Kim Tuyet, Ho Lai Tuan

Abstract


The article describes a gamma ray spectrometer protected by a lead shield (Model 747E Canberra lead shield) and an active shield made of an 80~cm \(\times\) 80~cm \(\times\) 3~cm plastic scintillator plate in anticoincidence on top of the lead shield. The detector used as low background gamma-spectrometer is a high purity Germanium crystal of model GC2018 Canberra. The background count rate currently achieved (30-2400 keV) is 1.27 cps without anticoincidence. The level of background suppression obtained from the active protection is 0.80 overall and about 0.43 for the 511 keV gamma line. The gamma ray spectrometer is installed and operated in the Nuclear Laboratory, Department of Nuclear Physics, University of Science, HCMC-Vietnam National University.

Keywords


Gamma ray spectrometer; cosmic rays; plastic scintillator; high-purity Germanium detector

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References


G. Heusser, The background components of germanium low-level spectrometers, Nuclear Instruments and Methods in Physics Research B: Vol.17,1986, pp.418-422

H.L. Malm and M.M. Watf, Background reduction in germanium spectrometers: Material selection geometry and shielding, Nuclear Instruments and Methods in Physics Research: Vol.223, 1984, pp.420-425.

Richard M. Lindstrom, David J. Lindstrom, Lester A. Slaback and John K. Langland, A low-background gamma-ray assay laboratory for activation analysis, Nuclear Instruments and Methods in Physics Research A: Vol.299, 1990, pp.425-429.




DOI: https://doi.org/10.15625/0868-3166/26/1/7474 Display counter: Abstract : 100 views. PDF : 30 views.

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