Title: Analysis of HPGe Spectra by Spectrum Matching - Experimental Verification
Authors: VIDMAR TimLIKAR AndrejVODENIK Branko
Citation: APPLIED RADIATION AND ISOTOPES vol. 67 no. 5 p. 716-718
Publication Year: 2009
JRC N°: JRC46426
ISSN: 0969-8043
URI: http://dx.doi.org/10.1016/j.apradiso.2009.01.016
DOI: 10.1016/j.apradiso.2009.01.016
Type: Articles in periodicals and books
Abstract: A new approach to spectrum analysis in gamma-ray spectrometry has recently been proposed. The approach is based on full, channel-by-channel matching of the measured spectrum with calculated synthetic spectra. These are created for each of the radionuclides in a context-sensitive radionuclide library and contain the peaks that would appear in the measured spectrum if the radionuclide were present in the sample. The input required for their synthesis consists of the full-energy-peak efficiency curve, the emission probabilities of the individual gamma rays and the corresponding coincidence summing correction factors. Also required are the suitably parameterized energy and peak-shape calibration curves. A search is made for the linear combination of these single-radionuclide spectra that matches the measured spectrum best, and the resulting coefficients in this combination are the desired activities of the radionuclides in the sample. In the optimization process, the parameters of the energy calibration and peak-shape curves are also determined. To avoid the need for modeling the background below the peaks in the spectra smoothed first derivatives of both the measured spectrum and the synthetic spectra are used, rather than their original shapes. In the paper, verification of the new method against experimental data is presented.
JRC Directorate:Health, Consumers and Reference Materials

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