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|Title:||Radiochemical Separation and Determination of 228Ra in Mineral Waters by Low-level Liquid Scintillation Counting|
|Authors:||VASILE Mirela; ALTZITZOGLOU Timotheos; BENEDIK Ljudmila; SPASOVA Yana; WAETJEN 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|
|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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