کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8043375 | 1518723 | 2013 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Detection of UH3+ and ThH3+ molecules and 236U background studies with low-energy AMS
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The performance of the TANDY AMS facility (0.6 MV) at ETH Zurich has been significantly improved for actinides with the installation of an additional 130° magnet on the high-energy side. The background originating from neighboring masses is reduced by three orders of magnitude in the new setup, leading to an abundance sensitivity of 10â10. This now allows 236U/238U measurements down to the 10â12 level. Systematic studies of the possible background for 236U3+ at the compact TANDY system show that actinide-hydride molecules in charge state 3+ do exist. (232Th1H)3+, (235U1H)3+ and (238U1H)3+ can cause a severe background at masses 233, 236, and 239, respectively. The existence of the (232Th1H)3+ molecule was verified unambiguously by analyzing its breakup. The actinide-hydride molecules can be destroyed efficiently using higher stripper pressures. At an ion energy of 1.2 MeV an overall efficiency of more than 10â4 can be achieved using a gas ionization detector. The high efficiency in combination with the low background opens the spectrum of possible applications to both anthropogenic (236U/238U = 10â7 to 10â9) and natural samples (236U/238U < 10â10).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 294, January 2013, Pages 364-368
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 294, January 2013, Pages 364-368
نویسندگان
Johannes Lachner, Marcus Christl, Christof Vockenhuber, Hans-Arno Synal,