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    Preparation of Mn-fiber standards for the efficiency calibration of the delayed coincidence counting system (RaDeCC)

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    Scholten et al 2010 Manuscript_vers final.pdf (416.6Kb)
    Date
    2010-04
    Author
    Scholten, Jan C.  Concept link
    Pham, Mai Khanh  Concept link
    Blinova, Oxana  Concept link
    Charette, Matthew A.  Concept link
    Dulaiova, Henrieta  Concept link
    Eriksson, Mats  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4396
    As published
    https://doi.org/10.1016/j.marchem.2010.04.009
    Keyword
     Radium isotopes; Mn-fiber standards; RaDeCC system; Efficiency determination 
    Abstract
    Precise measurements of the short lived radium isotopes 223Ra and 224Ra by means of the delayed coincidence counting system (RaDeCC) rely on an efficiency calibration of this system using Mn-fiber standards for which radium activities are exactly known. We prepared seventeen different standards by placing Mn-fibers in seawater spiked with various amounts of 227Ac (with 223Ra in radioactive equilibrium), 228Th (in radioactive equilibrium with 232Th and 224Ra) and 226Ra. We tested for quantitative adsorption of 227Ac and 228Th on the Mn-fibers by: (1) measuring 227Ac and 232Th in the residual solutions after preparing the Mn-fiber standards and (2) monitoring their 223Ra and 224Ra activities over a period of ~100 days. In the residual solutions, the activities of 227Ac and 232Th were < 1.0 % and < 5.3 %, respectively, of the activities initially added to the Mn-fibers. Our results indicate that Milli-Q water washing of the Mn-fibers is the major source of our observed losses of thorium. Measurements of 227Ac standards over 1½ years indicate a significant decrease of measurable 223Ra with time prohibiting the long-term use of 227Ac Mn-fiber standards. We found the 224Ra efficiency to be independent of the range of 227Ac, 228Th and 226Ra activities on the Mn-fibers standards used. The efficiency determination for 223Ra, however, may be biased in the case of relatively high 224Ra activities due to insufficient correction of chance of coincidence. Thus we suggest using a single 227Ac Mn-fiber standard for the efficiency determination for 223Ra.
    Description
    Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Marine Chemistry 121 (2010): 206-214, doi:10.1016/j.marchem.2010.04.009.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Scholten, Jan C., Pham, Mai Khanh, Blinova, Oxana, Charette, Matthew A., Dulaiova, Henrieta, Eriksson, Mats, "Preparation of Mn-fiber standards for the efficiency calibration of the delayed coincidence counting system (RaDeCC)", 2010-04, https://doi.org/10.1016/j.marchem.2010.04.009, https://hdl.handle.net/1912/4396
     

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