کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1878191 | 1532128 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Radioisotopic neutron transmission spectrometry: Quantitative analysis by using partial least-squares method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
تشعشع
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Neutron spectrometry, based on the scattering of high energy fast neutrons from a radioisotope and slowing-down by the light hydrogen atoms, is a useful technique for non-destructive, quantitative measurement of hydrogen content because it has a large measuring volume, and is not affected by temperature, pressure, pH value and color. The most common choice for radioisotope neutron source is 252Cf or 241Am-Be. In this study, 252Cf with a neutron flux of 6.3Ã106Â n/s has been used as an attractive neutron source because of its high flux neutron and weak radioactivity. Pulse-height neutron spectra have been obtained by using in-house built radioisotopic neutron spectrometric system equipped with 3He detector and multi-channel analyzer, including a neutron shield. As a preliminary study, polyethylene block (density of â¼0.947Â g/cc and area of 40Â cmÃ25Â cm) was used for the determination of hydrogen content by using multivariate calibration models, depending on the thickness of the block. Compared with the results obtained from a simple linear calibration model, partial least-squares regression (PLSR) method offered a better performance in a quantitative data analysis. It also revealed that the PLSR method in a neutron spectrometric system can be promising in the real-time, online monitoring of the powder process to determine the content of any type of molecules containing hydrogen nuclei.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Radiation and Isotopes - Volume 67, Issues 7â8, JulyâAugust 2009, Pages 1466-1470
Journal: Applied Radiation and Isotopes - Volume 67, Issues 7â8, JulyâAugust 2009, Pages 1466-1470
نویسندگان
Jong-Yun Kim, Yong Suk Choi, Yong Joon Park, Sung-Hee Jung,