Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 604, Issue 3, Pages 531-535Publisher
ELSEVIER
DOI: 10.1016/j.nima.2009.01.227
Keywords
Radium; Thorium; Sudbury Neutrino Observatory; Hydrous titanium oxide; Ion exchange; Liquid scintillation
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Funding
- United Kingdom by the Science and Technology Facilities Council
- National Research Council, Industry Canada
- Northern Ontario Heritage Fund Corporation
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The existing hydrous titanium oxide (HTiO) technique for the measurement of Ra-224 and Ra-226 in the water at the Sudbury Neutrino Observatory (SNO) has been changed to make it faster and less sensitive to trace impurities in the HTiO eluate. Using HTiO-loaded filters followed by cation exchange adsorption and HTiO co-precipitation, Ra isotopes from 200 to 450 tonnes of heavy water can be extracted and concentrated into a single sample of a few millilitres with a total chemical efficiency of 50%. Combined with beta-alpha coincidence counting, this method is capable of measuring 1.5 x 10(-3) mu Bq/kg of Ra-224 and 3.3 x 10(-3) mu Bq/kg of Ra-226 from the Th-232 and U-238 decay chains, respectively, for a 275 tonne D2O assay, which are equivalent to 4 x 10(-16) gTh/g and 3 x 10(-16) gU/g in heavy water. (C) 2009 Elsevier B.V. All rights reserved.
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