Correction of the chemical composition effect on the activity measurement of gamma emitters in environmental samples at low energy

If the sample and the calibration standard are identical in geometry and in density, many laboratories of radioactivity measurement using gamma spectrometry, do not proceed to the correction of the effect of the possible difference in chemical composition between them. Some laboratories proceed to t...

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Bibliographic Details
Published in:Applied radiation and isotopes 2019-09, Vol.151, p.81-88
Main Authors: Gharbi, F., Alshoaibi, A., Essouissi, I., Metwally, S.M.
Format: Article
Language:English
Subjects:
Calibration
Chemical composition effect
Detector
Gamma spectrometry
Geant4
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Summary:If the sample and the calibration standard are identical in geometry and in density, many laboratories of radioactivity measurement using gamma spectrometry, do not proceed to the correction of the effect of the possible difference in chemical composition between them. Some laboratories proceed to the correction of this effect using the usual simple ratio between the self absorption factor of the sample and the calibration standard based on the linear attenuation coefficients obtained using transmission experiments. In this work we studied this question by conducting Monte Carlo simulation of several typical environmental samples with different chemical compositions. We found that at low energy (E 
ISSN:0969-8043
1872-9800
DOI:10.1016/j.apradiso.2019.05.037