DocumentCode :
564813
Title :
Experimental comparison among pileup recovery algorithms for digital gamma-ray spectroscopy
Author :
El-Tokhy, Mohamed S. ; Mahmoud, I.I. ; Konber, H.A.
Author_Institution :
NRC, Eng. Dept., Atomic Energy Authority, Inshas, Egypt
fYear :
2012
fDate :
14-16 May 2012
Abstract :
This paper presents algorithms for overcoming a common problem of gamma-ray spectroscopy, namely the peak pileup recovery problem. Three different approaches are studied and evaluated within a spectroscopy system. The first approach is a direct search based on Nelder-Mead technique without any derivatives in order to find the local minimum points. A Gaussian shape in conjunction with the peak height and its position of each pulse are used to construct the pulse. Hence, the main pulse parameters such as peak amplitude, position and width can be determined. The second algorithm is based on the nonlinear least square method. In this paper another technique is tried. This technique which is proposed as third algorithm is based on a maximum peak search method combined with the first derivative method to determine peak position of each pulse. Comparison among these approaches is conducted in terms of parameters errors and execution time. This comparison based on a reference signal from 137Cs point source acquired by data acquisition system. The third approach shows the best accuracy, for determining accurate energy spectrum. Therefore, it provides better isotope identification than other algorithms.
Keywords :
Gaussian processes; data acquisition; gamma-ray spectroscopy; high energy physics instrumentation computing; least squares approximations; optimisation; search problems; solid scintillation detectors; spectral analysis; spectroscopy computing; 137Cs point source; Gaussian shape; Nelder-Mead technique; data acquisition system; digital gamma-ray spectroscopy; direct search; energy spectrum; first derivative method; isotope identification; local minimum points; maximum peak search method; nonlinear least square method; peak pileup recovery problem; pileup recovery algorithm; pulse construction; pulse parameter; pulse peak amplitude; pulse peak position; pulse width; spectroscopy system; Accuracy; Algorithm design and analysis; Detectors; Fitting; Shape; Signal processing algorithms; Spectroscopy; Least-Square Fitting; Nelder-Mead Modified Simplex; Peak Pileup; Tail Pileup;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Informatics and Systems (INFOS), 2012 8th International Conference on
Conference_Location :
Cairo
Print_ISBN :
978-1-4673-0828-1
Type :
conf
Filename :
6236523
Link To Document :
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