کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1262977 971926 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Towards a methodology for bulk sample neutron activation analysis
ترجمه فارسی عنوان
به سوی یک روش شناسی برای تجزیه و تحلیل فعال سازی نوترون نمونه بزرگ
کلمات کلیدی
تجزیه و تحلیل فعال سازی نوترون نمونه بزرگ؛ تصحیح خود محافظتی نوترون؛ تصحیح خودمیرایی گاما؛ NAA
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
چکیده انگلیسی

The main challenge in large sample neutron activation analysis (LSNAA) is the determination of neutron self-shielding and gamma ray self-attenuation corrections. After these corrections are determined, the analysis proceeds as in normal neutron activation analysis (NAA), as if the sample were infinitely small. In this paper, these corrections are calculated using the MCNP code for different standard sample geometries with different diameters. Modelling studies for LSNAA using an external neutron beam were performed. An analytical formula for the correction factors for neutron self-shielding and gamma ray self-attenuation is derived. The correction factors as well as flux parameters are calculated analytically. The analytical formula is verified using the MCNP code. All of the calculated parameters were tabulated and graphed. From the calculated data, other unknown material parameters could be obtained based on tabulated data or graphs. This method is a direct and easy method to perform large sample neutron activation analysis without complex calculations. In addition, for the user who does not have good experience with codes such as MCNP, she/he can use the chart or the tabulated information to define their unknown sample with the required information for the LSNAA experiment.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Taibah University for Science - Volume 10, Issue 2, March 2016, Pages 235–241
نویسندگان
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