Title: Radiochemical Separation and Determination of 228Ra in Mineral Waters by Low-level Liquid Scintillation Counting
Authors: VASILE MirelaALTZITZOGLOU TimotheosBENEDIK LjudmilaSPASOVA YanaWAETJEN Uwe
Citation: Proceedings of the 2008 International Liquid Scintillation Conference, ISBN: 978-0-9638314-6-0 p. 375-380
Publisher: RADIOCARBON, Department of Geosciences, The University of Arizona
Publication Year: 2009
JRC N°: JRC47904
URI: http://www.lsc-international.org/conf/pfiles/lsc2008-80.pdf
http://publications.jrc.ec.europa.eu/repository/handle/JRC47904
Type: Contributions to Conferences
Abstract: The activity concentration of Ra-228 in mineral waters was determined in order to establish reference values for a European intercomparison. The activity concentration of Ra-228 was quantified through the measurement of its daughter Ac-228. For the chemical yield determination, the 356-keV gamma-ray line of Ba-133 was used. After the first separation, via a Diphonix resin to remove potentially interfering actinides and lanthanides, the sample containing Ra-228 was stored for two days to reach secular equilibrium with its daughter Ac-228. The samples, after having been adapted to darkness and cooled, were measured using a Wallac Quantulus 1220TM ultra-low level liquid scintillation counter. The results obtained by liquid scintillation counting (LSC) are compared with the values found by alpha-particle spectrometry of Th-228, after its separation from sources produced one year earlier from the same mineral waters. These sources were originally used to determine Ra-226.
JRC Institute:Institute for Reference Materials and Measurements

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