Uncertainties associated with Ra and Ra measurements in water via a Delayed Coincidence Counter (RaDeCC) |
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| Authors: | E Garcia-Solsona J Garcia-Orellana P Masqu H Dulaiova |
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| Institution: | aDepartament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;bInstitut de Ciència i Tecnologia Ambientals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;cDepartment of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02536, USA |
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| Abstract: | The short-lived radium isotopes, 223Ra (T1/2 = 11.4 days) and 224Ra (T1/2 = 3.66 days), have been successfully used as tracers of several environmental processes, e.g., submarine groundwater discharge, coastal mixing processes, and water residence times. In this paper, the uncertainties associated with 223Ra and 224Ra measurements using a Radium Delayed Coincidence Counter are determined on a detailed error propagation basis with a confidence interval of 1σ. From the data analyses of several groups of coastal water samples, the calculated relative uncertainties averaged 12% for the 223Ra and 7% for the 224Ra. These uncertainties can decrease for radium-enriched groundwater samples although asymptotic limits have been found at 7% relative uncertainty for 223Ra and 4% for 224Ra. In this paper, the influence of sampling and measurement parameters on the final radium uncertainties is evaluated in order to provide guidance to optimize these factors and obtain more reliable results. |
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| Keywords: | Ra-223 Ra-224 Uncertainties propagation Radium Delayed Coincidence Counting Submarine groundwater discharge |
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