Dependence of photon interaction depth on linear attenuation coefficient in high pure germanium detectors

Yücel, Haluk; Çetiner, M. Atıf; Demirel, H.

doi:10.1016/0969-8043(95)00325-8

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…In this method, the full-energy peak efficiency is performed at discrete energies so one has to fit a curve using the measured points. The second method statistically models the interactions of each photon emitted from the source until it leaves the detector or deposit all of its energy within the active detector volume (Cejnar and Kovář, 1980;Baba et al, 1991;Yücel et al, 1996). For this method to be exact, one needs to model sufficiently a large number of source particles and details about the composition of detector and intercepting layers.…”

Section: Introductionmentioning

confidence: 99%

New numerical evaluation of parallelepiped NaI(Tl) detector geometrical and total efficiencies using extended sources

Noureddeen

Abbas

2017

Radioprotection

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Gamma-ray measurements in terrestrial/environmental samples require the use of high efficient detectors because of the low level of the radionuclide activity concentrations in the samples; thus scintillators are suitable for this purpose. The design of 4pNaI(Tl) parallelepiped g-ray scintillation detector with central square left void is considered an instructive case in radiation measurements, where it can be easily used in several critical applications including medical therapy, radiation protection, environmental exposure monitoring and neutron interaction. It is also extremely important to measure the activities of low radioactivity samples. Therefore, the understanding of the full scope of the multidimensional calibration and measurement process must be done with high accuracy. The present work is essentially concerned in introducing a new numerical evaluation to calculate the geometrical and total efficiency of a 4pNaI(Tl) parallelepiped scintillator detector using isotropic radiating g-ray point source. Also the average path lengths traveled by the photon inside the detector active medium have been calculated in order to study the characteristics of the source-to-detector configurations. This method depends mainly on the calculation of the solid angle subtended to the radioactive point source situated at various positions inside the detector and the photon path lengths through the detector active medium. In addition, the attenuation of the stainless steel absorber between the source and the detector material has been studied. The obtained results were compared with Monte Carlo and experimental published data to show the method's validity in the calibration process.

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Section: Introductionmentioning

confidence: 99%

New numerical evaluation of parallelepiped NaI(Tl) detector geometrical and total efficiencies using extended sources

Noureddeen

Abbas

2017

Radioprotection

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“…It was shown [2] that such a virtual point can be specified in measurements of the radioactivity point sources located on the symmetry axis of HPGe detector. Yücel et al [3] determined the dependence of VPD on linear attenuation coefficient in HPGe detectors. The VPD concept was also found to be applicable to point sources lying off the symmetry axis in non absorbing media [4] and expanded into the case with an absorbing medium between the source and the detector end-cap [5].…”

Section: Introductionmentioning

confidence: 99%

Determination of the dependence of HPGe virtual point detector location on source dimensions in 60 keV–2 MeV range using Monte Carlo simulation

Çeli̇k

2012

J. Inst.

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The virtual point detector (VPD) concept for an HPGe detector with 55% relative efficiency was confirmed for bulky sources having different diameters and heights. After reproducing experimental data, Monte Carlo simulation was used to investigate the dependence of VPD location on photon energy for various source diameters and heights in the energy range from 60 keV to 2 MeV. The simulations were confirmed using a soil reference source prepared by International Atomic Energy Agency (IAEA). It was seen that increasing photon energy makes significant changes in VPD location up to 600 keV. It was observed that VPD locations increase with increasing source diameter and height. It was also seen that VPD locations were approximately linearly dependent on source diameters and heights. KEYWORDS: Models and simulations; Gamma detectors (scintillators, CZT, HPG, HgI etc); Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc)

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Interpolation and extrapolation of NaI detector efficiencies

Presler

German³

et al. 2007

J Radioanal Nucl Chem

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Dependence of photon interaction depth on linear attenuation coefficient in high pure germanium detectors

Cited by 9 publications

References 7 publications

New numerical evaluation of parallelepiped NaI(Tl) detector geometrical and total efficiencies using extended sources

New numerical evaluation of parallelepiped NaI(Tl) detector geometrical and total efficiencies using extended sources

Determination of the dependence of HPGe virtual point detector location on source dimensions in 60 keV–2 MeV range using Monte Carlo simulation

Interpolation and extrapolation of NaI detector efficiencies

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