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Title: Computational characterization of HPGe detectors usable for a wide variety of source geometries by using Monte Carlo simulation and a multi-objective evolutionary algorithm
Authors: González Guerra, Jonay 
García Rubiano, Jesús 
Winter Althaus, Gabriel 
González Guerra, Antonio 
Alonso Hernández, Héctor 
Arnedo Ayensa, Miguel Ángel 
Tejera-Cruz, Alicia 
Martel Escobar, Pablo 
Bolivar, J. P.
UNESCO Clasification: 120601 Construcción de algoritmos
1206 Análisis numérico
120326 Simulación
Keywords: HPGe detectors
Efficiency calibration
Monte Carlo simulation
Marinelli beakers
Differential evolution multi-objective, et al
Issue Date: 2017
Journal: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 
Abstract: In this work, we have developed a computational methodology for characterizing HPGe detectors by implementing in parallel a multi-objective evolutionary algorithm, together with a Monte Carlo simulation code. The evolutionary algorithm is used for searching the geometrical parameters of a model of detector by minimizing the differences between the efficiencies calculated by Monte Carlo simulation and two reference sets of Full Energy Peak Efficiencies (FEPEs) corresponding to two given sample geometries, a beaker of small diameter laid over the detector window and a beaker of large capacity which wrap the detector. This methodology is a generalization of a previously published work, which was limited to beakers placed over the window of the detector with a diameter equal or smaller than the crystal diameter, so that the crystal mount cap (which surround the lateral surface of the crystal), was not considered in the detector model. The generalisation has been accomplished not only by including such a mount cap in the model, but also using multi-objective optimization instead of mono-objective, with the aim of building a model sufficiently accurate for a wider variety of beakers commonly used for the measurement of environmental samples by gamma spectrometry, like for instance, Marinellis, Petris, or any other beaker with a diameter larger than the crystal diameter, for which part of the detected radiation have to pass through the mount cap. The proposed methodology has been applied to an HPGe XtRa detector, providing a model of detector which has been successfully verificated for different source detector geometries and materials and experimentally validated using CRMs.
ISSN: 0168-9002
DOI: 10.1016/j.nima.2017.02.087
Source: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment [ISSN 0168-9002], v. 858, p. 113-122
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