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Article
The Treatment of Efficiency of NaI(Tl) Detector By Using Monte Carlo Simulation
معالجة كفاءة كاشف (NaI(Tl بإستخدام محاكاة مونت كارلو

Authors: A. B. Kadhem --- A. N. Mohammed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2010 Volume: 28 Issue: 5 Pages: 1001-1013
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

An efficient Monte Carlo computer program for simulation and calculation of thetotal and full energy peak efficiency (absolute and intrinsic) of the cylindricalNaI(Tl)detector (with different: volumes, source-detector separation and gamma raysenergies) is described. All the fundamental physical processes (photoelectric effect,compton scattering effect and pair production effect) occurring inside the detector aretaken into account. Very fast analytical expressions for the absorption coefficients areobtained. The same program can be used to calculate the response function of thedetector to gamma ray. The results show quite well agreement with experimental dataand with other calculations within error rate less than 2%. The results can be used ingamma spectroscopy and determining the activity of sources.

تم تصميم برنامج يعتمد طريقة مونت كارلو، كفوء في محاكاة وحساب الكفاءة الكلية وكفاءةالإسطواني (بحجوم ومسافات بين المصدر NaI(Tl) الإمتصاص الكلي (المطلقة والذاتية) لكاشفبنظر الإعتبار جميع العمليات الفيزيائية ˚ والكاشف وطاقات أشعة گاما ، مختلفة) . لقد أ خۥذتالرئيسة (الثأثير الكهروضوئي وتأثير ٳستطارة كومبتن وتأثير ٳنتاج الزوج) التي تحدث في الكاشفعند تفاعل أشعة گاما معه. ولزيادة فاعلية البرنامج ، فقد تم موائمة معاملات الإمتصاص لأشعة گاماٳستخدام البرنامج لحساب دالة ˝ في مادة الكاشف بتعابير رياضية كدالة للطاقة. ومن الممكن أيضاالإستجابة للكاشف لأشعة گاما. لقد أظهرت النتائج توافق عالي مع القياسات العملية والحساباتالنظرية الأ خۥرى بنسبة خطأ لاتتجاوز 2%. من الممكن ٳستخدام النتائج في قياسات طيف أشعةگاما وحساب فعالية المصادر المشعة


Article
Monte Carlo Simulation of Electronic Kinetics in Gas Discharge

Authors: A.B. Kadhem --- B.H. Hamad
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 3 Pages: 3-5
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The phenomenon of electrical gas discharge is present in manyapplications of plasma physics. Calculation of electrons motion tracingin gases are described. The backscattering probability of electrons tothe cathode has been estimated for values of E/P0 ratio from 10 to 200V.cm-1.torr-1 and for emission energies up to the lowest excitationpotential. The primary ionization coefficients and drift velocities wereevaluated for values of E/P0 ratio from 20 to 400 V.cm-1.torr-1. Theequilibrium of swarm with the field was considered in detail. It isshown that for uniform fields, deviations from exponential growth ofcurrent with increasing electrode separation occur if the interelectrodevoltage is not at least three times the mean energy ofelectrons impinging on the anode.


Article
Calculation of Charge Density Distribution of (2s-1d) Shell-Model Nuclei Using the Occupation Numbers of States

Authors: A.B. Kadhem --- E.M. Raheem
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2006 Volume: 2 Issue: 1-2 Pages: 31-36
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The charge density distribution (CDD) of 24Mg, 28Si, 30Si, 32S and 34S nuclei have been calculated using the wave functions of the harmonic oscillator on the assumption that the occupation numbers of the states in real nuclei differ from the predictions of the simple shell model. The difference of the CDD of (28Si-30Si) and (32S-34S) isotopes have been calculated to clarify the influence of the additional neutrons on the CDD. The elastic electron scattering form factors of the considered nuclei have been calculated using the ground state charge density distributions.Introducing an additional parameter () that reflects the difference of the occupation numbers of states between the real states of the nuclei and the simple shell model predictions, leads to a very good agreement between the calculated and experimental results of the CDD and form factors. This leads to the conclusion that proposing () as an additional parameter is a real one.

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