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- W417749905 abstract "Efficient ion sources are needed for detecting ultratrace U and Th impurities in a copper matrix by mass spectrometry techniques such as accelerator mass spectrometry (AMS). Two positive ion sources, a hot-cavity surface ionization source and a resonant ionization laser ion source, are evaluated in terms of ionization efficiencies for generating ion beams of U and Th. The performances of the ion sources are characterized using uranyl nitrate and thorium nitrate sample materials with sample sizes between 20 and 40 μg of U or Th. For the surface ion source, the dominant ion beams observed are UO+ or ThO+ and ionization efficiencies of 2–4% have been obtained with W and Re cavities. With the laser ion source, three-step resonant photoionization of U atoms has been studied and only atomic U ions are observed. An ionization efficiency of about 9% has been demonstrated. The performances of both ion sources are expected to be further improved." @default.
- W417749905 created "2016-06-24" @default.
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- W417749905 date "2015-10-01" @default.
- W417749905 modified "2023-10-16" @default.
- W417749905 title "Ion source development for ultratrace detection of uranium and thorium" @default.
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- W417749905 doi "https://doi.org/10.1016/j.nimb.2015.04.081" @default.
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