Participation in proficiency test for tritium strontium and caesium isotopes in seawater 2015 (IAEA-RML-2015-02)

A proficiency test (PT) exercise has proposed by the International Atomic Energy Agency (IAEA) in the frame of the IAEA Technical Cooperation project RAS/7/021 "Marine benchmark study on the possible impact of the Fukushima radioactive releases in the Asia-Pacific Region for Caesium Determination in Sea Water" since 2012. In 2015 the exercise was referred to Proficiency Test for Tritium, Strontium and Caesium Isotopes in Seawater 2015 (IAEA-RML-2015-02) to analyse³H, ¹³⁴Cs, ¹³⁷Cs and⁹⁰Sr in a seawater sample. OAP was one of the 17 laboratories from 15 countries from Asia-Pacific Region who joined the PT exercise. The aim of our participation was to validate our analytical performance for the accurate determination of radionuclides in seawater by developed methods of radiochemical analysis. OAP submitted results determining the concentration for the three elements i.e. ¹³⁴Cs, ¹³⁷Cs and⁹⁰Sr in seawater to the IAEA. A critical review was made to check suitability of our methodology and the criteria for the accuracy, precision and trueness of our data. The results of both ¹³⁴Cs and ¹³⁷Cs passed all criteria which were assigned "Accepted" statuses. Whereas ⁹⁰Sr analysis did not pass the accuracy test therefore it was considered as "Not accepted" Our results and all other participant results with critical comments were published in the IAEA proficiency test report. (paper)