کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9845606 | 1526516 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Methods of scattering corrections for quantitative neutron radiography
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
ابزار دقیق
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The idea is to consider the scattered neutrons in a computational procedure. The obtained corrected image data set can then be evaluated according to the exponential attenuation law or reference values obtained by simulations or experiments. The correction is based on the iterative reconstruction of the measured image by overlapping point scattered functions (PScF). The PScFs are determined by Monte-Carlo simulations using the MCNPX software. Important parameters beside the material are the dimensions of the sample, the distance between sample and detector, the detector properties and the energy spectrum of the initial neutron beam. Evaluations of measurements with different detectors result in differing effective attenuation cross-sections of the samples. This can be explained by the different detector sensitivity on the epithermic domain of the energy spectrum. If the sample is inside an enclosing material (e.g. water in a container), this can affect the evaluation of the samples cross-section. Also this effect is understood with the PScF and can be taken into account. For known simple geometries the reconstructions are in good agreement with the measurements and allow a more exact evaluation of the involved cross-sections.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 542, Issues 1â3, 21 April 2005, Pages 353-360
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 542, Issues 1â3, 21 April 2005, Pages 353-360
نویسندگان
René Hassanein, Eberhard Lehmann, Peter Vontobel,