Determination of gamma-Ray Peak Efficiency, Including Correction for Self-Absorption, in Cubic Samples

摘要

By developing on the existing method, which expresses the calculated efficiency of bulk samples as the product of a term which depends only on energy and a term which depends only on the thickness of the sample, we arrived at a method of calculating efficiency, which includes self-absorption, by using approximation by (a set of) parallel lines to the latter. This method involves finding the two parameters experimentally by using one set of single energy, base bulk source of gamma radiation with different heights (for example, sup 137 Cs solution), and then combining them with a relative efficiency curve obtained from a multi-nuclide point source of radiation. This method has the advantage that it is easy to use. As a result of measuring various types of mock samples which have densities and gamma-ray energy which cover a wide range of actual environmental samples using a Ge semiconductor spectrometer, we have shown that errors resulting from self-absorption can be adequately corrected and can be of practical use. (Atomindex citation 16:076545)