پديد آورنده :
شاكري ورزنه، علي
عنوان :
محاسبه ي ضرايب انباشت پرتودهي اشعه گاما براي حفاظ هاي متوالي با استفاده از كد محاسباتي MCNP
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك
صفحه شمار :
[هشت] ، 79،[II] ص: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
احمد شيراني
استاد مشاور :
محمد حسن علامت ساز
توصيفگر ها :
پراكندگي كامپتون , مقطع تامسون , اثر فتو الكتريك , روش واپس زني، كاهن , بلوك پيغام
تاريخ نمايه سازي :
29/2/86
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
AbstractIn this thesis the exposure buildup factors of gamma rays have been calculated in theenergy rang from 40keV to 10MeV for point isotropic sources placed in the center of aspherical two layer shield consisting of 5mfp water 8mfp lead using the MCNP codeand the effects of coherent scattering and bremsstrahlung radiation on these factors havebeen investigated The results obtained show the effect of coherent scattering is significantup to gamma ray energies of about 200keV in the water layer and up to about 2MeV in thelead layer The bremsstrahlung radiation which is considerable above 5MeV in the leadlayer is quite significant at 10MeV and increases with shield thickness such that at 10mfpthe bremsstrahlung radiation causes an increase of more than 30 per cent in the buildupfactor These results show good agreement with previous works in which different methodsof calculations have been used In this thesis exposure buildup factors have also beencalculated by taking into account all kinds of interactions of gamma rays with matter forshields of various thicknesses of water and lead from 0mfp water 13mfp lead to 10mfpwater 3mfp lead in the energy rang from 3 to 10MeV These factors can be used fordesigning stratified shields of water lead in this energy rang
استاد راهنما :
احمد شيراني
استاد مشاور :
محمد حسن علامت ساز
