کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1685790 1010576 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
26Al and 36Cl AMS system at the University of Tsukuba: A progress report
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
26Al and 36Cl AMS system at the University of Tsukuba: A progress report
چکیده انگلیسی

With the current AMS system on the 12UD Pelletron tandem accelerator at the University of Tsukuba, we are able to measure the long-lived radioisotopes of 14C, 26Al, 36Cl and 129I by employing a molecular pilot beam method that stabilizes the terminal voltage with 0.1% accuracy. Several major improvements have been made to increase the sensitivity of the AMS system to 26Al and 36Cl radioisotopes. For 26Al-AMS, the ions extracted from the ion source have been changed from Al− to AlO− by using an Al2O3 target sample. In addition, 26MgO− molecular ions are used as a pilot beam to control the terminal voltage through slit current feedback. Also, a fully-stripping AMS technique is used to achieve an effective detection limit of better than 5 × 10−15 for the 26Al/27Al ratio. For 36Cl-AMS, the terminal voltage has been increased from 9 MV to 10 MV, thereby increasing the energy of the 36Cl9+ beam to 100 MeV. This energy increment helps us to get a clearer separation between 36Cl and 36S in a new ΔE−E detector. In addition, the yield of 36Cl9+ is increased by 1.5 times as a result of the higher ion energy at the terminal stripper foil. The standard deviation of the fluctuations of the 36Cl/35Cl ratio is within ±2%, and the effective detection limit is better than 2.0 × 10−14.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 259, Issue 1, June 2007, Pages 41–46
نویسندگان
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