Title: Activity Ratios of 137Cs, 90Sr and 239/240Pu in Environmental Samples
Authors: BOSSEW PETERLETTNER HERBERTHUBMER AlexanderERLINGER C.GASTBERGER M.
Citation: JOURNAL OF ENVIRONMENTAL RADIOACTIVITY vol. 97 no. 1 p. 5-19
Publisher: ELSEVIER SCI LTD
Publication Year: 2007
JRC Publication N°: JRC35483
ISSN: 0265-931X
URI: http://www.elsevier.com/locate/jenvrad
http://publications.jrc.ec.europa.eu/repository/handle/JRC35483
DOI: 10.1016/j.jenvrad.2007.02.008
Type: Articles in Journals
Abstract: Both global and Chernobyl fallout have resulted in environmental contamination with radionuclides such as 137Cs, 90Sr and 239þ240Pu. In environmental samples, 137Cs and 239þ240Pu can be divided into the contributions of either source, if also the isotopes 134Cs and 238Pu are measurable, based on the known isotopic ratios in global and Chernobyl fallout. No analogous method is available for 90Sr. The activity ratios of Sr to Cs and Pu, respectively, are known for the actual fallout mainly from air filter measurements; but due to the high mobility of Sr in the environment, compared to Cs and Pu, these ratios generally do not hold for the inventory many years after deposition. In this paper we suggest a method to identify the mean contributions of global and Chernobyl fallout to total Sr in soil, sediment and cryoconite samples from Alpine and pre-Alpine regions of Austria, based on a statistical evaluation of Sr/Cs/Pu radionuclide activity ratios. Results are given for Sr:Cs, Sr:Pu and Cs:Pu ratios. Comparison with fallout data shows a strong depletion of Sr against Cs and Pu.
JRC Institute:Institute for Environment and Sustainability

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