نتایج جستجو برای: چشمۀ 252cf at
تعداد نتایج: 3719119 فیلتر نتایج به سال:
background: monte carlo simulations play a vital role in the calculation of the necessary shielding both for neutrons and photons. advanced and simple shielding materials against neutron and gamma rays were compared by simulation using the mcnb4b monte carlo code. the simulations were carried out for the three common neutron sources, namely the 252cf, the 241am/be and the dd neutron generator w...
The effect of pre-gamma irradiation on track density, bulk etch rate and light absorbance in CR-39 was investigated. CR-39 detectors were irradiated with gamma doses over a range of 0 to 280 kGy (0 to 28 Mrad). The detectors were overlaid with 0.77 mm of polyethylene and exposed to a known fluence of 252Cf spontaneous fission neutrons. All detectors were then etched in 6.25N sodium hydroxide so...
در مناطق کارستی، هدف اساسی، روش ژئوفیزیکی بررسی قسمتهایی ازسنگهای کربناته است که مشاهدۀ مستقیم آنها امکان ندارد. با روش ژئوفیزیکی، می توان در مورد حجم سنگ و تشریح افقهای حاوی ناپیوستگیهایی که در مطالعات کارست، بسیار اهمیت دارد، اطلاعات باارزشی بهدست آورد. منطقۀ مورد تحقیق در زونهای زاگرس رورانده و چین خورده، قرار دارد و از سازندهای سخت (کربناته)تشکیـل شده است. چشمههای کارستی استان کرمان...
The leakage neutron spectrum measurements have been done on benchmark spherical assembly-nickel sphere with a diameter of 50 cm and copper cube (block) dimensions 49.5 x 48 cm3 in Research Centre Rez (RC Rez). 252Cf source was placed into the centre nickel cube. proton recoil method used for measurement using hydrogen proportional detectors (HPD) pressure 400 1000 kPa (diameter is 4 cm) scintil...
Background: Monte Carlo simulations play a vital role in the calculation of the necessary shielding both for neutrons and photons. Advanced and simple shielding materials against neutron and gamma rays were compared by simulation using the MCNB4B Monte Carlo code. The simulations were carried out for the three common neutron sources, namely the 252Cf, the 241Am/Be and the DD neutron generator w...
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