Monte Carlo simulation of the response functions of CdTe detectors to be applied in X-ray spectroscopy
A. Tomal, J. C. Santos, P. R. Costa, A. H. Lopez Gonzales and M. E. Poletti
ARTIGO
Inglês
Agradecimentos: The authors thank CNPq for support through the project 483170/2013-5 and CNPq/FAPESP funding of project by INCT - Metrology of ionizing radiation in medicine
Abstract: In this work, the energy response functions of a CdTe detector were obtained by Monte Carlo (MC) simulation in the energy range from 5 to 160keV, using the PENELOPE code. In the response calculations the carrier transport features and the detector resolution were included. The computed...
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Abstract: In this work, the energy response functions of a CdTe detector were obtained by Monte Carlo (MC) simulation in the energy range from 5 to 160keV, using the PENELOPE code. In the response calculations the carrier transport features and the detector resolution were included. The computed energy response function was validated through comparison with experimental results obtained with 241Am and 152Eu sources. In order to investigate the influence of the correction by the detector response at diagnostic energy range, x-ray spectra were measured using a CdTe detector (model XR-100T, Amptek), and then corrected by the energy response of the detector using the stripping procedure. Results showed that the CdTe exhibits good energy response at low energies (below 40keV), showing only small distortions on the measured spectra. For energies below about 80keV, the contribution of the escape of Cd- and Te-K x-rays produce significant distortions on the measured x-ray spectra. For higher energies, the most important correction is the detector efficiency and the carrier trapping effects. The results showed that, after correction by the energy response, the measured spectra are in good agreement with those provided by a theoretical model of the literature. Finally, our results showed that the detailed knowledge of the response function and a proper correction procedure are fundamental for achieving more accurate spectra from which quality parameters (i.e., half-value layer and homogeneity coefficient) can be determined
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
483170/2013-5
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
Fechado
Tomal, Alessandra, 1983-
Autor
Monte Carlo simulation of the response functions of CdTe detectors to be applied in X-ray spectroscopy
A. Tomal, J. C. Santos, P. R. Costa, A. H. Lopez Gonzales and M. E. Poletti
Monte Carlo simulation of the response functions of CdTe detectors to be applied in X-ray spectroscopy
A. Tomal, J. C. Santos, P. R. Costa, A. H. Lopez Gonzales and M. E. Poletti
Fontes
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Applied radiation and isotopes Vol. 100 (June, 2015), p. 32-37 |