Self-absorption correction in gamma-ray spectrometry of environmental samples – an overview of methods and correction values obtained for the selected geometries
نویسنده
چکیده
The activity of samples in gamma-ray spectrometry is derived from the efficiency curve ε(E) determined for a calibration source (standard). In the case of volume sources the method gives excellent results when the sample and the standard are handled in the same geometric setup as they have the same chemical composition and density and hence the same self-absorption. In practical applications, it is not always so as the sample and source materials might be entirely different. Environmental samples may vastly differ in their chemical composition, their density ranging from near 0 to about 2.0 g/cm. That is why the self-absorption correction factor Cs is required to account for the differences in self-absorption between the source and the standard. For a given geometric setup, the correction factor is expressed as the ratio of efficiency of standard to that of the sample:
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تاریخ انتشار 2006