Performance report for the low energy compact radiocarbon accelerator mass spectrometer at Uppsala University

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• 作者：M. Salehpour^a ; ^{mehran.salehpour@physics.uu.se" class="auth_mail" title="E-mail the corresponding author} ; K. Hå ; kansson^a ; G. Possnert^a ; L. Wacker^b ; H.-A. Synal^b
• 关键词：Uppsala ; Accelerator Mass Spectrometry ; Green MICADAS ; Ultra small samples ; Biomedical
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2016
• 出版时间：15 March 2016
• 年：2016
• 卷：371
• 期：Complete
• 页码：360-364
• 全文大小：1533 K

文摘

A range of ion beam analysis activities are ongoing at Uppsala University, including Accelerator Mass Spectrometry (AMS). Various isotopes are used for AMS but the isotope with the widest variety of applications is radiocarbon. Up until recently, only the 5 MV Pelletron tandem accelerator had been used at our site for radiocarbon AMS, ordinarily using 12 MeV ^14,13,12C³⁺ ions. Recently a new radiocarbon AMS system, the Green-MICADAS, developed at the ion physics group at ETH Zurich, was installed. The system has a number of outstanding features which will be described. The system operates at a terminal voltage of 175 kV and uses helium stripper gas, extracting singly charged carbon ions. The low- and high energy mass spectrometers in the system are stigmatic dipole permanent magnets (0.42 and 0.97 T) requiring no electrical power nor cooling water. The system measures both the ¹⁴C/¹²C and the ¹³C/¹²C ratios on-line. Performance of the system is presented for both standard mg samples as well as μg-sized samples.