جلد 13، شماره 4 - ( مجله پژوهش فيزيك ايران، زمستان 1392 )                   جلد 13 شماره 4 صفحات 383-389 | برگشت به فهرست نسخه ها


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Alamatsaz M H, Mohseni M. A polynomial–based function approach to point isotropic gamma-ray buildup factor data in double layered spherical shield of water and lead. IJPR. 2014; 13 (4) :383-389
URL: http://ijpr.iut.ac.ir/article-1-874-fa.html
علامت ساز محمدحسن، محسنی مریم السادات. استخراج ضریب انباشت تابش‌های گاما به صورت تابع چند جمله‌ای در حفاظ‌های کروی دولایه‌ای (آب – سرب) . مجله پژوهش فيزيك ايران. 1392; 13 (4) :383-389

URL: http://ijpr.iut.ac.ir/article-1-874-fa.html


، alamatsa@cc.iut.ac.ir
چکیده:   (3984 مشاهده)
As the input of MCNP code (Monte Carlo N - Particle code system), a monoenergetic and isotropic point source with the energy rangeg from 0.3 to 10 MeV was placed at the center of a spherical material surrounded by another one. The first shielding material was water and the second one was lead. The total thickness of the shield varied between 2 to 10 mfp. Then, using the output of MCNCP, exposure build up factor was calculated. The MCNP computed data were analyzed by plotting the buildup factor as a function of each independent variable (energy, first material thickness and second material thickness) and observing the trends. Based on the trends, we examined many different expressions with different number of constants. By MINUIT the FORTRAN program, the constants were calculated, which gave the best agreement between the MCNP-computed exposure buildup factors and those obtained by the formula. At last, we developed a polynomial formula with 11 constants that reproduced exposure buildup factor with a relative error below 2% (in comparison with the MCNP result).
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نوع مطالعه: پژوهشي | موضوع مقاله: تخصصي

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