Title: The use of solid angle for alpha detector efficiency in 226Ra analyses of soil samples
Authors: DIRICAN ABDULLAHERDEN Pinar EsraSEFERINOGLU MeryemPOMME Stefaan
Citation: APPLIED RADIATION AND ISOTOPES vol. 70 no. 9 p. 2260-2262
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2012
JRC N°: JRC67187
ISSN: 0969-8043
URI: http://www.sciencedirect.com/science/article/pii/S0969804312001625#
http://publications.jrc.ec.europa.eu/repository/handle/JRC67187
DOI: 10.1016/j.apradiso.2012.02.114
Type: Contributions to Conferences
Abstract: In the frame of proficiency tests organized by IAEA and IRMM, the specific activity concentration of radium-226 in soil has been measured. The BaSO4 co-precipitation technique has been used. Normally, in this method, the detector efficiency of the alpha spectrometer is determined by using a 226Ra source with known activity. As an alternative to using a 226Ra standard, we calculated the detector efficiency from the relative solid angle subtended by the detector on the soil samples. The accuracy of this method depends on the uncertainty on geometrical properties and the distribution of activity within the source. An uncertainty budget is provided. The method was applied successfully in the intercomparisons.
JRC Institute:Institute for Reference Materials and Measurements

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