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- W2068582013 abstract "Abstract A 1 MV AMS was installed at KIGAM (Korea Institute of Geoscience and Mineral Resources) in 2007. We usually measure 14C at charge state 2+ because beam transmission yield reaches maximum value at a terminal voltage of 950 kV. However, this condition always has the possibility of interference by Li22+ molecules. To avoid the interference, samples with high Li contents need to be measured with charge states 1+ or 3+ because lithium ions only form the even charge states. Therefore, it was necessary to investigate the operating conditions of our AMS machine with charge state 1+ or 3+. The optimized condition for 1+ measurement was found to be 500 kV for terminal voltage and 2.5 × 10−2 mbar for stripper gas pressure. After setting up operating conditions for measurement with C1+, standard (IAEA C1, C7 and C8), blank, unknown wood and charcoal samples were measured and the results were compared with those obtained with a C2+ beam. The background level was determined to be as low as 2–5 × 10−15 for 14C1+." @default.
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- W2068582013 date "2015-10-01" @default.
- W2068582013 modified "2023-10-01" @default.
- W2068582013 title "Radiocarbon measurement with 1 MV AMS at charge state 1+" @default.
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- W2068582013 doi "https://doi.org/10.1016/j.nimb.2015.04.037" @default.
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