دانلود مقاله ISI انگلیسی شماره 148333
کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
148333 2018 7 صفحه PDF سفارش دهید 4985 کلمه
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
Multi-source irradiation facility with improved space configuration for neutron activation analysis: Design optimization
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Applied Radiation and Isotopes, Volume 135, May 2018, Pages 135-141

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پیش نمایش مقاله

چکیده انگلیسی

A neutron irradiation facility consisting of six 241Am-Be neutron sources of 30 Ci total activity and 6.6 × 107 n/s total neutron yield is designed. The sources are embedded in a cubic paraffin wax, which plays a dual role as both moderator and reflector. The sample passage and irradiation channel are represented by a cylindrical path of 5 cm diameter passing through the facility core. The proposed design yields a high degree of space symmetry and thermal neutron homogeneity within 98% of flux distribution throughout the irradiated spherical sample of 5 cm diameter. The obtained thermal neutron flux is 8.0 × 104 n/cm2.s over the sample volume, with thermal-to-fast and thermal-to-epithermal ratios of 1.20 and 3.35, respectively. The design is optimized for maximizing the thermal neutron flux at sample position using the MCNP-5 code. The irradiation facility is supposed to be employed principally for neutron activation analysis.

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