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    • Radiocarbon, Volume 25 (1983)
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    Miniature Signals and Miniature Counters: Accuracy Assurance Via Microprocessors and Multiparameter Control Techniques

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    Author
    Currie, L. A.
    Gerlach, R. W.
    Klouda, G. A.
    Ruegg, F. C.
    Tompkins, G. B.
    Issue Date
    1983-01-01
    Keywords
    miniature gas counters
    aerosols
    detection
    data acquisition
    microcomputers
    computers
    accuracy
    measurement
    techniques
    data processing
    sample preparation
    methods
    geochronology
    C 14
    carbon
    isotopes
    radioactive isotopes
    absolute age
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    Citation
    Currie, L. A., Gerlach, R. W., Klouda, G. A., Ruegg, F. C., & Tompkins, G. (1983). Miniature signals and miniature counters: Accuracy assurance via microprocessors and multiparameter control techniques. Radiocarbon, 25(2), 553-564.
    Publisher
    American Journal of Science
    Journal
    Radiocarbon
    Description
    From the 11th International Radiocarbon Conference held in Seattle, Washington, June 20-26, 1982.
    URI
    http://hdl.handle.net/10150/652740
    DOI
    10.1017/S0033822200005865
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    When 14C signals approach background levels, the validity of assumptions concerning Poisson counting statistics and measurement system stability becomes crucial in interpreting the resultant low-level counting observations. This has been demonstrated in our previous work on detection limits for non-Poisson error and it is critical in our current studies of carbonaceous pollutants, where the 14C signal from just 5 mg C is comparable to that of the background for our miniature gas proportional counters. To assure data quality, our multi-detector system is designed for the on-line monitoring of critical parameters that reflect both the (statistical) nature of the non-Poisson errors and the underlying (physical) causes. It sends >60 bits of information/pulse to a microprocessor which automatically generates, for each counting period, two-dimensional spectra and multiparameter correlation and control charts. To evaluate the validity of long-term counting of 1–10 mg C we use robust (statistical) estimators, optimal counting interval subdivision, and time series analysis of the individual pulses. New opportunities for selective sampling and chemical fractionation which come with the small sample measurement capability have led us to give special attention also to higher control levels, involving e g, isotonic heterogeneity and representative standard materials.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200005865
    Scopus Count
    Collections
    Radiocarbon, Volume 25, Number 2 (1983)

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