Evaluation of the efficiency curve of a Cadmiun Telluride detector for low-energy photon spectrometry

Correia, Amanda Ribeiro; Iwahara, Akira; Cruz, Paulo Alberto Lima da; Silva, Carlos José da; Tauhata, Luiz; Poledna, R.; Silva, Ronaldo Lins da; Filho, P. P. de Queiroz; Lopes, Ricardo Tadeu

doi:10.1016/j.apradiso.2016.08.008

Cited by 1 publication

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“…Recently, detailed experimental measurements of the detection efficiency of a 5×5×1 mm 3 CdTe detector were reported covering energies in the 5.89 keV (Fe-55) to 136.47 keV (Co-57) range [14]. The authors found that the CdTe detector measured emission probabilities of relevant x-and γ-rays consistent with the available published data.…”

Section: Introductionmentioning

confidence: 55%

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Study of CdTe detection efficiency for medical applications using Geant4-based stochastic simulations

Basit

Siddique²,

Mirza³

et al. 2018

J. Radiol. Prot.

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The determination of detection efficiency and peak-to-total ratios has been performed for rectangular CdTe detectors for various x-ray and low-energy γ-ray source configurations including parallel beams, point, and cylindrical sources. The dependence of efficiency values on axial and off-axial distances, detector thickness and area, and source dimensions has been studied. The detector model developed in this work has been validated by comparing the Monte Carlo simulated values of detector efficiency for a parallel incident beam with the available published data and good agreement has been found with discrepancies remaining within 2% throughout the energy range. Geant4 simulations show nearly 100% photopeak and total efficiency with peak-to-total ratios approaching a maximum value of 1.0 for photons in the 4–70 keV energy range. Similar high values of detection efficiency have been obtained for brachytherapy I-125 seed sources having cylindrical geometries which indicates the suitability of CdTe detectors for the calibration of sources used in therapy. The logistic power curve was found excellent for empirically fitting the photopeak efficiency variations with axial displacement of the I-125 brachy source in the horizontal configuration. Geant4 simulations clearly show that small thicknesses, of the order of 0.5 mm, of CdTe material are sufficient for attaining almost 100% detection efficiency for low-energy photons having energies up to 100 keV.

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Section: Introductionmentioning

confidence: 55%

“…Summary of geometry dimensions (in mm) of various parts of the 5×5 mm 2 rectangular CdTe detector[14].…”

mentioning

confidence: 99%

Study of CdTe detection efficiency for medical applications using Geant4-based stochastic simulations

Basit

Siddique²,

Mirza³

et al. 2018

J. Radiol. Prot.

View full text Add to dashboard Cite

show abstract

Evaluation of the efficiency curve of a Cadmiun Telluride detector for low-energy photon spectrometry

Cited by 1 publication

References 4 publications

Study of CdTe detection efficiency for medical applications using Geant4-based stochastic simulations

Study of CdTe detection efficiency for medical applications using Geant4-based stochastic simulations

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