کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1193732 1492347 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Isotope ratio measurements of pg-size plutonium samples using TIMS in combination with “multiple ion counting” and filament carburization
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Isotope ratio measurements of pg-size plutonium samples using TIMS in combination with “multiple ion counting” and filament carburization
چکیده انگلیسی

A sample preparation procedure for isotopic measurements using thermal ionization mass spectrometry (TIMS) was developed which employs the technique of carburization of rhenium filaments. Carburized filaments were prepared in a special vacuum chamber in which the filaments were exposed to benzene vapour as a carbon supply and carburized electrothermally. To find the optimal conditions for the carburization and isotopic measurements using TIMS, the influence of various parameters such as benzene pressure, carburization current and the exposure time were tested. As a result, carburization of the filaments improved the overall efficiency by one order of magnitude.Additionally, a new “multi-dynamic” measurement technique was developed for Pu isotope ratio measurements using a “multiple ion counting” (MIC) system. This technique was combined with filament carburization and applied to the NBL-137 isotopic standard and samples of the NUSIMEP 5 inter-laboratory comparison campaign, which included certified plutonium materials at the ppt-level. The multi-dynamic measurement technique for plutonium, in combination with filament carburization, has been shown to significantly improve the precision and accuracy for isotopic analysis of environmental samples with low-levels of plutonium.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mass Spectrometry - Volume 279, Issues 2–3, 15 January 2009, Pages 87–92
نویسندگان
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