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Progress at the Isotrace Radiocarbon Facility

  • Roelf P Beukens (a1), Debbie M Gurfinkel (a1) and Henry W Lee (a1)
Abstract

Since August 1984 over 100 samples have been analyzed. 12C, 13C, and 14C isotopes were measured after acceleration and all dates were corrected for natural and preparation-induced fractionation. A precision of better than 1.0% was obtained for samples 10,000 yr BP or less and these results were shown to be reproducible at precision levels as low as 0.3%. An accuracy of better than 1.0% was demonstrated for the same age range by analyzing samples which were previously dated with the conventional technique. The machine background, measured on blank sample holders in a clean ion source, yielded a count rate equivalent of 0.015 ± 0.007% modern.

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References
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Bedrich, W, Koch, B, Mai, H, Seidenkranz, U, Syhre, H and Voigtmann, R, 1983, Distortion of secondary ion extraction due to sample surface irregularities, in Benninghoven, A, Giber, J, Laszlo, J, Riedel, M and Werner, H W, eds, Internatl conf on secondary ion mass spectrometry, 3rd, Proc: Springer series in chemical physics, v 19, p 8187.
Beukens, R P and Lee, H W, 1981, The production of small carbon samples by RF dissociation of acetylene, in Kutschera, W, eds, Symposium on accelerator mass spectrometry, 2nd, Proc: Argonne Natl Lab, p 416425.
Gurfinkel, D M, 1984, 14C sample preparation: Isotrace 1984 ann rept, p 530.
Lee, H W (ms), 1985, Study of 14C detection and dating using accelerator mass spectrometry: PhD dissert, Univ Toronto.
Kieser, W E, Beukens, R P, Kilius, L R, Lee, H W and Litherland, A E, 1986, Isotrace radiocarbon analysis—equipment and procedures, in Internatl conf on ionbeam analysis, 7th, Proc: Nuclear Instruments & Methods, v B15, p 718721.
Shimizu, N and Hart, S R, 1982, Isotope fractionation in secondary ion mass spectrometry Jour Appl Physics, v 53, no. 3, p 13031311.
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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
  • URL: /core/journals/radiocarbon
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