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Entree

Development of a procedure for hyper-pure germanium detector response calibration combining experimental measurements with Monte Carlo simulations

Processo: 10/52616-7
Linha de fomento:Auxílio à Pesquisa - Regular
Vigência: 01 de setembro de 2011 - 31 de agosto de 2014
Área do conhecimento:Ciências Exatas e da Terra - Física - Física Nuclear
Convênio/Acordo: DFG
Pesquisador responsável:Nora Lia Maidana
Beneficiário:Nora Lia Maidana
Pesq. responsável no exterior: Lorenzo Brualla Barberá
Instituição no exterior: University of Duisburg-Essen, Alemanha
Instituição-sede: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brasil
Assunto(s):Espectroscopia de raio gama 

Resumo

Knowledge of the efficiency curve of hyper-pure germanium (HPGe) detectors is essential for a broad range of applications. However, its accurate determination requires lengthy and costly experiments. Although there have been some attempts in the past to produce a method based on Monte Carlo simulations of the detector to make less difficult to obtain the efficiency curve, none of them has reached accuracies better than 5%. During the proposed project we intend to perform a systematic study of all major parameters that determine the agreement between an experimental and a simulated efficiency curve. We shall take into account the dimensions of the crystal, the modeling of dead layers, the incomplete charge collection, the electric field in the detector and charge carrier traps. The objective is to produce a method for determining the efficiency curve in which not only the agreement of the full energy peak is sought, but also of the single and double escape peaks and the continuum part of the spectrum. (AU)

Publicações científicas
(Referências obtidas automaticamente do Web of Science e do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores)
MAIDANA, NORA L.; VANIN, VITO R.; GARCIA-ALVAREZ, JUAN A.; HERMIDA-LOPEZ, MARCELINO; BRUALLA, LORENZO. Experimental HPGe coaxial detector response and efficiency compared to Monte Carlo simulations. Applied Radiation and Isotopes, v. 108, p. 64-74, FEB 2016. Citações Web of Science: 6.
BRUALLA, LORENZO; MAIDANA, NORA L.; VANIN, VITO R. Determination of the detection efficiency of a planar HPGe detector with a non-uniform frontal dead layer. X-RAY SPECTROMETRY, v. 44, n. 3, SI, p. 89-92, MAY-JUN 2015. Citações Web of Science: 2.
MAIDANA, NORA L.; VANIN, VITO R.; JAHNKE, VIKTOR; FERNANDEZ-VAREA, JOSE M.; MARTINS, MARCOS N.; BRUALLA, LORENZO. Efficiency calibration of x-ray HPGe detectors for photons with energies above the Ge K binding energy. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SP, v. 729, p. 371-380, NOV 21 2013. Citações Web of Science: 13.

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