GESPECOR: A versatile tool in gamma-ray spectrometry
ABSTRACT Abstract GESPECOR is a Monte Carlo based software developed for the computation of efficiency, of matrix effects and of coincidence summing effects in gamma-ray spectrometry. GESPECOR can be applied to coaxial and well-type HPGe or to Ge(Li) detectors and to various types of sources, including point, cylindrical, and spherical sources or Marinelli beakers. In this paper the structure of GESPECOR is presented and the procedures applied are described. The uncertainty of the results computed by GESPECOR is carefully analyzed. The analysis shows that GESPECOR is able to provide results with a well defined uncertainty, in a user friendly WINDOWS environment.
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ABSTRACT: The radioactive waste containers, containing different radioactive materials, have to be characterized before their final disposal. Destructive methods, although being the most precise, are also the most expensive and not the easiest ones from the radioprotection point of view. In this situation, high resolution gamma spectrometry proved to be a reliable method for the non destructive assay method. However, the non-homogenous composition of the radioactive waste inside the drum makes the quantitative characterization of the radioactive waste drum a difficult task. The efficiency calibration procedure is difficult and dependent on different parameters such as: experimental set-up, the sources distribution inside the drum, and also on the nuclear data used for the calculations. The experimental studies complemented with the performed Monte Carlo calculations are presented in this paper.Journ. Phys. 01/2008; 53:7-8.
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ABSTRACT: The quality of the results of gamma spectrometry measurement depends directly on the accuracy of the detection efficiency in the specific measurement conditions. Traditionally, measurements are performed in gamma-ray spectrometry by the so-called relative method, according to which a standard sample is first used for calibration; the standard sample should match the measured one in all the important characteristics, such as its size, chemical composition and density. The preparation of the standard is costly and time consuming, especially if the laboratory is required to measure samples with different geometries. Experimental efficiency calibration is restricted to several measurement geometries and cannot be applied directly to all measurement configurations. An alternative possibility of being able to compute the efficiencies is thus highly desirable. The purpose of this work is to examine the applicability of the efficiency transfer method for the computation of the efficiency in various measurement geometries on the basis of the measured efficiency for reference point source geometry. For this, the ETNA (Efficiency Transfer for Nuclide Activity measurements) code is used. In this study the transfer method was applied for the computation of the efficiency of a high purity germanium (HPGe) detector for a point source placed at several distances and in addition for volume sources of different compositions and densities on the basis of the reference efficiency measured for a point source located at 10 cm distance from the detector. The experimental efficiency curves were compared with the prediction of the ETNA software.Romanian Reports in Physics. 01/2010; 62:57-64.