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Measurements of Strontium-90 in portuguese milk samples using liquid scintillation counting technique

Published online by Cambridge University Press:  06 June 2009

J. Barescut ,
I. Lopes  and
M. J. Madruga
I. Lopes*
Affiliation:
Nuclear and Technological Institute, Radiological Protection and Safety Unit, E. N. 10, Apartado 21, 2686-953 Sacavém, Portugal
M. J. Madruga
Affiliation:
Nuclear and Technological Institute, Radiological Protection and Safety Unit, E. N. 10, Apartado 21, 2686-953 Sacavém, Portugal
*
[email protected]
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Abstract

The objective of this study is the implementation of a method combining extraction chromatography and liquid scintillation counting (LSC) technique to the determination of 90Sr in milk samples. The strontium separation is performed using the commercially available Sr-resin (Eichrom) and the beta counting is carried out using a liquid scintillation detector system (Tri-Carb 3170 TR/SL, Packard). Firstly, the trials are performed with 300 mL of milk and 0.7 g of resin. Validation trials are carried out using spiked milk samples with different 90Sr activities and the accuracy of the methodology is also been tested with an IAEA 152 reference milk sample. The results obtained had shown good accuracy of expected value. The minimum detectable activity (MDA) obtained for a confidence level of 95% and 60 minutes of sample counting time was 0.20 Bq L-1. In order to improve the detection limits for 90Sr, 1 liter of milk and 3 g of resin were used and the MDA value in these conditions was improved to 0.012 Bq L-1. The method was applied to the determination of the 90Sr concentrations in milk samples from different regions of Portugal.

Type
Research Article
Information
Radioprotection , Volume 44 , Issue 5: ECORAD 2008 - Radioecology and Environmental Radioactivity , 2009 , pp. 217 - 220
Copyright
© EDP Sciences, 2009

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References

Brun S., Y. Kergadallan, B. Boursier, J.-M. Fremy and F. Janin Lait 83 (2003) 1-15. CrossRef
Jakopic R. and L. Benedik, Acta Chim. Slov. 52 (2005) 297-302.
Torres J.M., M. Llauradó, G. Rauret, M. Bickel, T. Altzitzoglou and R. Pilviö, Anal. Chim. Acta 414 (2000) 101-111. CrossRef
Brun S., S. Bessac, D. Uridat and B. Boursier, J. Radioanal. Nucl. Chem. 253 (2002) 191-197. CrossRef
Horwitz E.P., R. Chiarizia and M.L. Dietz, Solvent Extr. Ion Exch. 10(1992) 313-336. CrossRef
Hewitt W.J. and G. Bronislawa, Radioactivity & Radiochemistry 5 (1994) 8-16.
Grahek Ž., K. Kožutic and M. Rožmarié-Mačefat, J. Radioanal. Nucl. Chem. 268 (2006) 179-190. CrossRef
Madruga M.J. Applied Radiation and Isotopes, http://dx.doi.org/10.1016/j.apradiso.2008.04.008 (2008). CrossRef
Chobola R., P. Mell, L. Daróczi and A. Vincze, J. Radioanal. Nucl. Chem., 267 (2006) 297-304.
Popov L., X. Hou, S. P. Nielson, Y. Yu, R. Djingova and I. Kuleff, J. Radioanal. Nucl. Chem., 269 (2006) 161-173.
Currie L.A., Analytic Chemistry 40 (1968) 586-593. CrossRef
Lopes I. and Madruga M.J., in LSC 2008 Advances in Liquid Scintilation Spectrometry International Conference, Davos, Switzerland, 25-30 May 2008.
Madruga M.J., A.S. Lemos and L. Machado, in Proceed. 9a Conferência Nacional do Ambiente, Aveiro, 2007, C. Borrego et al. (Eds), Publ. Universidade de Aveiro, Portugal (ISBN: 978-972-789-230-3) pp. 147.
Calvo A, I. Tovar, C. Castillo, R. Collantes, A. Carmona and L. Salvador, in Programas de Vigilância Radiológica Ambiental - Resultados 2004. Colección Informes Técnicos INT-04.11, Consejo de Seguridad Nuclear, Depósito legal: M-17.978-2006 (2005).
STUK-B-77, in Surveillance of Environmental Radiation in Finland. Annual Report 2006, R. Mustonen (Ed.): Radiation and Nuclear Safety Authority, Yliopistopaino, Helsinki, ISBN 978-952-478-233-6 (2007).