The validity of the virtual point detector concept for absorbing media

Presler, O.; German, U.; Pelled, O.; Alfassi, Zeev B.

doi:10.1016/j.apradiso.2003.11.019

Cited by 28 publications

(14 citation statements)

References 4 publications

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“…(7). Some works were published in the past dealing with the determination of this parameter for germanium detectors [3][4][5], but we performed lately investigations also on NaI(Tl) detectors, of the same type that were used in the present work. We found the value for 75 Â 75 mm NaI(Tl) detectors to be 1.7270.15 cm.…”

Section: The Methodologymentioning

confidence: 93%

“…As mentioned before, x is the distance of the point source from the center of the source volume towards detector 2, the physical length of the absorber is 2a, and d can be evaluated, based on the concept of the virtual point detector [3][4][5].…”

Section: The Methodologymentioning

confidence: 99%

“…Assuming the virtual point detector concept [3][4][5], the detectors can be represented by equivalent points placed at certain distances from their face. This assumption greatly simplifies the mathematical handling and enables the developing of relatively simple expressions.…”

Section: The Methodologymentioning

confidence: 99%

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Radioactive point source localization in a bulky volume

Presler

German²,

Alfassi

2005

Nuclear Instruments and Methods in Physics Research Section A:

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Section: The Methodologymentioning

confidence: 93%

Section: The Methodologymentioning

confidence: 99%

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Radioactive point source localization in a bulky volume

Presler

German²,

Alfassi

2005

Nuclear Instruments and Methods in Physics Research Section A:

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“…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]. The VPD concept was confirmed for scintillation detectors [6].…”

Section: Introductionmentioning

confidence: 86%

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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“…In previous studies [11,12,14], we have shown that the virtual point detector concept can be applied to HPGe detector for a point source configuration, both in non-absorbing and absorbing media and off the symmetry axis. The aim of the present work was to check the possibility to extend the virtual point detector model also to NaI(Tl) and BGO scintillation detectors, and to find a semi-empirical formula derived from measurements, which can describe accurately the expected count rates of a bulky detector due to radioactive sources placed at different distances from the detector cap.…”

Section: Introductionmentioning

confidence: 99%