کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1884529 1043351 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A semi-empirical approach to determine gamma activities (Bqkg-1) in environmental cylindrical samples
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
A semi-empirical approach to determine gamma activities (Bqkg-1) in environmental cylindrical samples
چکیده انگلیسی
A semi-empirical method to determine radionuclide concentrations in large environmental samples without the use of reference material and avoiding the typical complexity of Monte-Carlo codes is proposed. The calculation of full-energy peak efficiencies was carried out from a relative efficiency curve (obtained from the gamma spectra data), and the geometric (simulated by Monte-Carlo), absorption, sample and intrinsic efficiencies for energies between 130 and 3000 keV. The absorption and sample efficiencies were determined from the mass absorption coefficients, whereas the intrinsic efficiency was approximated by an empirical function. The deviations between calculated and experimental efficiencies for a reference material in most cases are less than 10%. Radionuclide activities in marine sediment samples calculated by the proposed method and by the experimental comparative method were not significantly different. This new method can be used for routine environmental monitoring when uncertainties up to 10% are acceptable.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Measurements - Volume 43, Issue 1, January 2008, Pages 77-84
نویسندگان
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