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Determination of 90Sr/90Y in Wheat Grains, Soil, and Deposition Samples by TBP Extraction and Cerenkov Counting

Published online by Cambridge University Press:  18 July 2016

Udo Ch Gerstmann  and
Vlasta Tschöpp
Udo Ch Gerstmann*
Affiliation:
GSF-National Research Center for Environment and Health, Institute of Radiation Protection, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany
Vlasta Tschöpp
Affiliation:
GSF-National Research Center for Environment and Health, Institute of Radiation Protection, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany
*
Corresponding author. Email: gerstmann@gsf.de.
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Abstract

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Within the framework of radioecological studies, 90Sr was determined in wheat grains, soil, and deposition samples. The radiochemical purification of 90Y consisted of liquid-liquid extraction by tributyl phosphate (TBP), followed by hydroxide and oxalate precipitations and, if necessary, the removal of thorium by anion exchange chromatography. The procedure proved to be very robust and reliable, having yttrium yields of 92.7 ± 4.6% for 1-kg wheat samples, 90.9 ± 4.2% for 50-g soil samples, and 90.6 ± 3.2% for wet and dry deposition samples. 90Y was determined by Cerenkov counting and proportional counting. By optimizing the Cerenkov counting window, a figure of merit (FOM) of 4750 could be reached using a Quantulus™ 1220 system. Minimum detectable activities were in the range of 10 mBq.

Type
Articles
Information
Radiocarbon , Volume 48 , Issue 2 , 2006 , pp. 197 - 204
Copyright
Copyright © 2006 by the Arizona Board of Regents on behalf of the University of Arizona 

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