Iranian Journal of Physics Research
مجله پژوهش فيزيك ايران
IJPR
Basic Sciences
http://ijpr.iut.ac.ir
1
admin
1682-6957
2345-3664
10.18869/acadpub.ijpr
fa
jalali
1392
12
1
gregorian
2014
3
1
13
4
online
1
fulltext
fa
استخراج ضریب انباشت تابشهای گاما به صورت تابع چند جملهای در حفاظهای کروی دولایهای (آب – سرب)
A polynomial–based function approach to point isotropic gamma-ray buildup factor data in double layered spherical shield of water and lead
تخصصي
general
پژوهشي
Research
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).
گاما, لایهی آب, لایهی سرب, ضریب انباشت پرتودهی, کد محاسباتی MCNP, کد فرترن MINUIT
gamma ray, layer of water, layer of lead, exposure buildup factor, MCNP code
383
389
http://ijpr.iut.ac.ir/browse.php?a_code=A-10-890-1&slc_lang=fa&sid=fa
M. H.
Alamatsaz
محمدحسن
علامت ساز
alamatsa@cc.iut.ac.ir
`10031947532846008155`

10031947532846008155
Yes
M.
Mohseni
مریم السادات
محسنی
maryam.mohseni_nucphysics@yahoo.com
`10031947532846008156`

10031947532846008156
No