Preliminary AMS measurements of ¹⁰Be at the CENTA facility

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• 作者：Miroslav Je&scaron ; kovsk&yacute ; ^a ; Peter Steier^b ; Alfred Priller^b ; Robert Breier^a ; Pavel P. Povinec^a ; ^{povinec@fmph.uniba.sk" class="auth_mail" title="E-mail the corresponding author} ; Robin Golser^b
• 关键词：10Be ; AMS ; CENTA ; Ionization chamber ; SiN absorber
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2015
• 出版时间：15 October 2015
• 年：2015
• 卷：361
• 期：Complete
• 页码：139-142
• 全文大小：955 K

文摘

Very sensitive methods, presently mainly accelerator mass spectrometry (AMS) are necessary for analysis of cosmogenic ¹⁰Be in the environment. AMS is mainly limited by the stable isobar ¹⁰B, while the requirements for mass separation are the least stringent of all standard isotopes analyzed by AMS. We tested a possibility to measure ¹⁰Be using a small switching magnet as an analyzer of accelerated ions, and an ionization chamber with a silicon nitride foil stack used as a passive absorber. A detection limit of 10⁻¹² for the ¹⁰Be/⁹Be isotopic ratio was obtained using this technique, which was mainly determined by scattering of ⁹Be⁺² ions on residual gas inside the switching magnet.