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Compton suppression gamma-counting: The effect of count rate

Nuclear Instruments and Methods In Physics Research

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DOI: 10.1016/0167-5087(84)90685-9

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Abstract

Past research has shown that anti-coincidence shielded Ge(Li) spectrometers enhanced the signal-to-background ratios for gamma-photopeaks, which are situated on high Compton backgrounds. Ordinarily, an anti- or non-coincidence spectrum (A) and a coincidence spectrum (C) are collected simultaneously with these systems. To be useful in neutron activation analysis (NAA), the fractions of the photopeak counts routed to the two spectra must be constant from sample to sample to variations must be corrected quantitatively. Most Compton suppression counting has been done at low count rate, but in NAA applications, count rates may be much higher. To operate over the wider dynamic range, the effect of count rate on the ratio of the photopeak counts in the two spectra (A/C) was studied. It was found that as the count rate increases, A/C decreases for gammas not coincident with other gammas from the same decay. For gammas coincident with other gammas, A/C increases to a maximum and then decreases. These results suggest that calibration curves are required to correct photopeak areas so quantitative data can be obtained at higher count rates. ?? 1984.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Compton suppression gamma-counting: The effect of count rate
Series title:
Nuclear Instruments and Methods In Physics Research
DOI:
10.1016/0167-5087(84)90685-9
Volume
223
Issue:
2-3
Year Published:
1984
Language:
English
Publisher:
Eslevier
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
416
Last page:
419
Number of Pages:
4