Rapid Method for Low Level 90Sr Determination in Seawater by Liquid Extraction Technique
Determination of low level 90Sr in seawater has been widely developed for the purpose of environmental monitoring and radiological research because 90Sr is one of the most hazardous radionuclides released from atmospheric during the testing of nuclear weapons, waste discharge from the generation nuclear energy and nuclear accident occurring at power plants. A liquid extraction technique using bis-2-etylhexyl-phosphoric acid to separate and purify yttrium followed by Cherenkov counting using a liquid scintillation counter to determine 90Y in secular equilibrium to 90Sr was developed to monitor 90Sr in the Asia Pacific Ocean. The analytical performance was validated for the accuracy, precision, and trueness criteria. Sr-90 determination in seawater using various low concentrations in a range of 0.01 – 1 Bq/L of 30 liters spiked seawater samples and 0.5 liters of IAEA-RML-2015-01 proficiency test sample was performed for statistical evaluation. The results had a relative bias in the range from 3.41% to 12.28%, which is below accepted relative bias of ± 25% and passed the criteria confirming that our analytical approach for determination of low levels of 90Sr in seawater was acceptable. Moreover, the approach is economical, non-laborious and fast.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1317098Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 364
 S. L. Maxwell, B. K. Culligan, J. B. Hutchison and R. C. Utsey, J RadioanalNucl Chem., vol. 303, pp.709-717, 2015.
 Korea Atomic Research Energy Institute, “Table of Nuclides,” http://atom.karei.re.kr, accessed 10 Dec. 2016.
 National Council on Radiation Protection and Measurements, Management of persons contaminated with radionuclides. Report No. 161, 2008.
 L. Salonen, Determination of Strontium-90 and Strontium-89 in Environmental Samples by Liquid Scintillation Counting, Liquid Scintillation Counting. London: Heyden&Son, 1977.
 W. J. Major, K. D. Lee and R. A. Wessman, EarthPlanet. Sci. Lett, vol. 16, pp. 138-140, 1972.
 R. Fukai, G. Statham and K. Asara, Rapp. Comm. Intern. Mer M6dit., vol. 23, 1976.
 J. Borcherding and H. Nies, J RadioanalNucl Chem., vol. 98, pp.127-131, 1986.
 J. Suomela, L. Wallberg, and J. Melin, Method for Determination of Strontium-90 in Food and Environmental Samples by Cherenkov Counting. Stockholm: Swedish Radiation Protection Institute, 1993.
 S. Visetpotjanakit and N. Nakkaew, International Journal of Environmental, Chemical, Ecological, Geological and Geophysical Engineering, vol. 11, pp.432-435 2017.
 H.H. Ross, Theory an Application of Cherenkov Counting, Liquid Scintillation Science and Technology. New York: Academic Press Inc., 1976.
 A. V. Harms, I. Osvath and D. Osborn, IAEA-RML-2015-02 Proficiency Test for Determination of Radionuclides in Sea Water. Vienna: IAEA, 2015.