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Tajik M.,Damghan University | Tajik M.,Nuclear Science Research School | Ghal-Eh N.,Damghan University | Etaati G.R.,University of Tehran | Afarideh H.,University of Tehran
Radiation Physics and Chemistry | Year: 2014

The response of an NE213 (or its BICRON equivalent, BC501A) scintillator attached to different sizes of polished/painted lightguides when exposed to 241Am-Be neutrons has been simulated. This kind of simulation basically needs both particle and light transports: the transport of neutrons and neutron-induced charged particles such as alphas, protons, carbon nuclei and so on has been undertaken using MCNPX whilst the scintillation light transport has been performed with PHOTRACK codes. The comparison between simulated and experimental response functions of NE213 attached to different sizes of polished/painted lightguides and also the influence of length/covering of lightguide on the detection efficiency and uniformity of the scintillator-lightguide assembly response have been studied. © 2013 Elsevier Ltd.

Tajik M.,Nuclear Science Research School | Tajik M.,Damghan University | Ghal-Eh N.,Damghan University | Etaati G.R.,University of Tehran | Afarideh H.,University of Tehran
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2013

This paper reports on how to generate the response function of an NE213 scintillator when exposed to mono-energetic neutrons using the PTRAC card of the MCNPX code. The light transport part of the simulation has been undertaken with the Monte Carlo PHOTRACK code. The comparison confirms that the simulated response function represents a promising agreement with the previously published simulations and experiments. © 2012 Elsevier B.V.

Pishkoo A.,Nuclear Science Research School | Pashaei R.,Islamic Azad University at Tehran
Journal of Computational and Theoretical Nanoscience | Year: 2015

Using Laplacian operator in f-dimensional fractional space in three-spatial coordinates, in this paper the reaction-Diffusion equation is solved for fractal (porous) domains. Our previous work had focused on how Meijer's G-functions are deduced as the solutions of the Reaction-Diffusion process in making Micro- and Nano-structures with assumption being in ordinary (not fractional) space. However, in porous domains some of the regions or domains are not filled with medium particles so to describe appropriately these regions the fractional model is needed. We express the solution of reaction-diffusion equation in cylindrical coordinates system in terms of elementary and Meijer's G-functions. Copyright © 2015 American Scientific Publishers All rights reserved.

Kazemeini-Asl A.,Islamic Azad University at Karaj | Larijani M.M.,Nuclear Science and Technology Research Institute, Iran | Fathollahi V.,Nuclear Science Research School
Micro and Nano Letters | Year: 2014

Cu thin films sputter-coated on single crystals of silicon were implanted with 30 keV nitrogen ions under various doses from 1.9 × 1017 to 5.7 × 1017 ions/cm2. The prepared samples were subsequently annealed in nitrogen atmosphere. The grazing incidence X-ray diffraction analysis revealed that in addition to the crystalline copper nitride phase, copper azides were developed by nitrogen ion implantation. With an increase of the implantation dose to 2.3 × 1018 ions/cm2, much of the Cu film was transformed to the crystalline Cu3N phase. Furthermore, the effect of nitrogen ion implantation on Cu thin films under various doses was investigated. The structural properties, morphology and sheet resistance of samples were investigated by grazing incidence X-ray diffraction, atomic force microscopy, field emission scanning electron microscopy and four-point probe techniques, respectively. In addition, the dependence of resistivity of the implanted samples on the implantation dose as well as structural properties is discussed. © 2014 The Institution of Engineering and Technology.

Deevband M.R.,University of Tehran | Abdolmaleki P.,University of Tehran | Kardan M.R.,Nuclear Science Research School | Khosravi H.R.,Nuclear Science and Technology Research Institute, Iran | Taheri M.,Nuclear Science Research School
Applied Radiation and Isotopes | Year: 2011

The response of PADC was calculated by Monte Carlo simulation using MCNPX code. H, C and O recoils as well as nuclear reactions have been taken into account. The calculated results show important contribution to detection efficiency of PADC due to H, C and O recoils. The irradiated detectors with 241Am-Be source and 241Am-Be softened with a spherical polyethylene moderator were electrochemically etched. The paper presents the results of the experimental and Monte Carlo simulations, which are in a good agreement. © 2010 Elsevier Ltd.

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