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van Rooy MW, van Staden MJ, Lubbe J, et al. Activity determination of (59)Fe by 4π beta-gamma counting using liquid scintillation in the beta channel. Appl Radiat Isot. 2015;109:276-280doi: 10.1016/j.apradiso.2015.11.054.
van Rooy, M. W., van Staden, M. J., Lubbe, J., & Simpson, B. R. S. (2016). Activity determination of (59)Fe by 4π beta-gamma counting using liquid scintillation in the beta channel. Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine, 109276-280. https://doi.org/10.1016/j.apradiso.2015.11.054
van Rooy, M W, et al. "Activity determination of (59)Fe by 4π beta-gamma counting using liquid scintillation in the beta channel." Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine vol. 109 (2016): 276-280. doi: https://doi.org/10.1016/j.apradiso.2015.11.054
van Rooy MW, van Staden MJ, Lubbe J, Simpson BRS. Activity determination of (59)Fe by 4π beta-gamma counting using liquid scintillation in the beta channel. Appl Radiat Isot. 2016 Mar;109:276-280. doi: 10.1016/j.apradiso.2015.11.054. Epub 2015 Nov 22. PMID: 26631452.
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Appl Radiat Isot. 2016 Mar;109:276-280. doi: 10.1016/j.apradiso.2015.11.054. Epub 2015 Nov 22.

Activity determination of (59)Fe by 4π beta-gamma counting using liquid scintillation in the beta channel.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

M W van Rooy, M J van Staden, J Lubbe, B R S Simpson

Affiliations

  1. Radioactivity Standards Laboratory, NMISA, 15 Lower Hope Road, Rosebank 7700, Cape Town, South Africa. Electronic address: [email protected].
  2. Radioactivity Standards Laboratory, NMISA, 15 Lower Hope Road, Rosebank 7700, Cape Town, South Africa.

PMID: 26631452 DOI: 10.1016/j.apradiso.2015.11.054

Abstract

This paper reports on absolute activity measurements of iron-59 made at the National Metrology Institute of South Africa (NMISA) via 4π(LS)β-γ coincidence counting. The exercise formed part of an Asia Pacific Metrology Program (APMP) regional key comparison. Source data were analysed by the extrapolation technique for a number of gamma-ray window settings. In addition, a feasibility study was undertaken on a second technique; a non-extrapolation method based on a detection efficiency analysis. The reported activity concentration of the (59)Fe solution was determined with a relative uncertainty of 0.28% (k=1), the uncertainty being due mainly to the rate vs. efficiency fitting process. The result from the non-extrapolation method was lower than that given by extrapolation by 0.33%, within two standard deviations. Possible reasons for the small discrepancy are discussed.

Copyright © 2015. Published by Elsevier Ltd.

Keywords: Extrapolation technique; Iron-59; Liquid scintillation coincidence counting; Non-extrapolation method

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