An investigation of the repeatability of calibration factors in gamma-ray spectrometry of geological materials
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Date
2004-01
Authors
Mustapha, A.O.
Patel, J. P.
Rathore, I. V. S.
Hashim, N. O.
Otwoma, D.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
A NaI(Tl)-based gamma spectrometer for the analysis of geological materials was calibrated using the IAEA reference materials RGU-1, RGTH-1 and RGK-1. To simulate typical geological samples, two additional standards were prepared from aliquots of the three reference materials. The reproducibility of the instrument calibration factors (CFs) was tested by repeated measurements of the pure IAEA reference materials and the mixed samples in a reproducible counting geometry. The results were analysed using a two-way classification analysis of variance; it was found that the variance in the CFs is significantly higher between standards than it is between measurements. Allowance should be made for this when estimating uncertainties in measurements with the NaI(Tl) spectrometers.
Description
dx.doi.org/10.1016/j.apradiso.2003.09.008
Keywords
Gamma spectrometer, Calibration, IAEA reference materials, Naturally occurring radionuclides, Analysis of variance
Citation
Journal of Applied Radiation and Isotopes: Volume 60, Issue 1, Pages 79–82