| Texto completo | |
| Autor(es): |
Maidana, Nora L.
[1]
;
Vanin, Vito R.
[1]
;
Garcia-Alvarez, Juan A.
[1, 2]
;
Hermida-Lopez, Marcelino
[3, 4]
;
Brualla, Lorenzo
[3]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Fis, Travessa R 187, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil
[2] Inst Super Tecnol & Ciencias Aplicadas, Dept Fis Nucl, Ave Salvador Allende & Luaces, Habana 10600, Havana 6163 - Cuba
[3] Univ Klinikum Essen, Strahlenklin, NCTeam, Hufelandstr 55, D-45122 Essen - Germany
[4] Hosp Univ Vall dHebron, Serv Fis & Proteccio Radiol, Pg Vall dHebron 119-129, Barcelona 08035 - Spain
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Applied Radiation and Isotopes; v. 108, p. 64-74, FEB 2016. |
| Citações Web of Science: | 6 |
| Resumo | |
The peak efficiency for photons hitting the frontal surface of a medium volume n-type HPGe coaxial detector is mapped using acutely collimated beams of energies between 31 and 383 keV from a Ba-133 radioactive source. Simulated values obtained with the Monte Carlo radiation transport code PENELOPE, using a model that respected actual detector dimensions and physical constants while varying dead-layer thicknesses, allowed us to fit the experimental results in the detector bulk but not near its rim. The spectra of a Cs-137 source were measured using the detector shielded from the natural background radiation, with and without a broad angle collimator. The corresponding simulated spectra, using the fitted dead-layer thicknesses, underestimate the continuum component of the spectra and overestimate the peak efficiency, by less than ten percent in the broad angle collimator arrangement. The simulated results are sensitive to the photon attenuation coefficients. (C) 2015 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 10/52616-7 - Development of a procedure for hyper-pure germanium detector response calibration combining experimental measurements with Monte Carlo simulations |
| Beneficiário: | Nora Lia Maidana |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |