Browsing by Author "Ozmutlu E."

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Calculation of angular distribution of 662 keV gamma rays by Monte Carlo method in copper medium
(2009-12-01) Kahraman A.; Ozmutlu E.; Gurler O.; Yalcin S.; Kaynak G.; Gundogdu O.
This paper presents results on the angular distribution of Compton scattering of 662 keV gamma photons in both forward and backward hemispheres in copper medium. The number of scattered events graph has been determined for scattered gamma photons in both the forward and backward hemispheres and theoretical saturation thicknesses have been obtained using these results. Furthermore, response function of a 51×51 mm NaI(Tl) detector at 60° angle with incoming photons scattered from a 10 mm thick copper layer has been determined using Monte Carlo method. © 2009 Elsevier Ltd. All rights reserved.
Monte Carlo analyses of multiple backscattering of gamma rays
(2013-02-01) Akar Tarim U.; Ozmutlu E.; Gurler O.; Yalcin S.
We have written a Monte Carlo code to simulate the experimental results of a previously reported study. We were able to analyse the energy distributions of photons that reached the detector system after suffering several successive Compton scatterings in the target. We have also investigated how the number of multiply backscattered events depends on the target thickness and the energy of the primary photons. © 2012 Akadémiai Kiadó, Budapest, Hungary.
Monte Carlo modelling of single and multiple Compton scattering profiles in a concrete material
(2013-04-01) Akar Tarim U.; Ozmutlu E.; Gurler O.; Yalcin S.; Gundogdu O.; Sharaf J.; Bradley D.
A Monte Carlo simulation study has been conducted of 60Co photons Compton scattered in concrete, illustrating the degraded energy spectra of gamma-ray radiation. Results are produced representing a NaI(Tl) detector model. We were able to analyse energy distributions of photons that reach the detector system after suffering several successive Compton scatterings in the target. The predicted decrease in intensity of single- and multiple-scattering peaks with increase in thickness of the target medium are in good agreement with experimental observations and findings reported by others. © 2012 Elsevier Ltd.
The effect of the housing material on the NaI(Tl) detector response function
(2012-07-01) Akar Tarim U.; Ozmutlu E.; Gurler O.; Yalcin S.
In this study, a Monte Carlo program has been developed to simulate the response function of the NaI(Tl) detector with all features for 60Co and 137Cs and to investigate the effects of detector housing material on response function. The pulse height spectra in a 2″ × 2″ NaI(Tl) detector due to these gamma ray sources have been measured. Comparison of the experimentally obtained and simulated spectra shows that there is good agreement between both spectra. Energy distributions of gamma photons that generate the backscattering peak in the response function were obtained and the contribution of single, double and multiple Compton scattering events to these distributions was investigated. © 2012 Akadémiai Kiadó.
The energy spectrum of 662keV photons in a water equivalent phantom
(2012-01-01) Akar Tarim U.; Gurler O.; Ozmutlu E.; Yalcin S.; Gundogdu O.; Sharaf J.; Bradley D.
Investigation is made on the energy spectrum of photons originating from interactions of 662. keV primary gamma-ray photons emitted by a point source positioned at the centre of a water equivalent solid phantom of dimensions 19. cm×19. cm×24. cm. Peaks resulting from total energy loss (photopeak) and multiple and back scattering have been observed using a 51. mm×51. mm NaI(Tl) detector; good agreement being found between the measured and simulated response functions. The energy spectrum of the gamma photons obtained through the Monte Carlo simulation reveals local maxima at about 100. keV and 210. keV, being also observed in the experimental response function. Such spectra can be used as a method of testing the water equivalence of solid phantom media before their use for dosimetry measurements. © 2012 Elsevier Ltd.