Abstract.A simple method to determine 137 Cs in seawater has been developed based on the use of a Cu-hexacyanoferrate scavenger. The Cu-hexacyanoferrate supported on cotton wound cartridge filter was used to absorb 137 Cs from seawater by passing large volumes over the cartridge filters with flowrate of 240 L hr -1 . Results from the Cu-hexacyanoferrate method were proved acceptable for accuracy with bias below 20 % i.e. -9.16 to + 18.55 % when compared with the traditional ammonium molybdophosphate pre-concentration method. This developed method is cost-effective and less time consuming. In addition it can be easily performed at sampling fields.
Abstract.A rapid method to determine 137 Cs in seawater using Cu-hexacyanoferrates ion exchanger has been developed and verified for purpose of Thailand routine and emergency environmental radiation monitoring. The Cu-hexacyanoferrate supported cotton-wound cartridge filters were used to absorb 137 Cs from spiked synthesis seawater by passing various large volumes i.e. 200 L, 300 L and 400 L over the filters with slow flow rate at 240 L/hr. The filter samples were converted to ash through a heating step and directly measured with gamma ray analysis using HPGe detector. The result showed acceptable accuracy with bias below ± 25%, in the range from -24.63% to + 3.29%. This developed method is cost-effective and easily to performed in sampling fields and can be optimised its accuracy with analysis time when it needed.
Sr 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 134 Cs and 137 Cs passed all criteria which were assigned "Accepted" statuses. Whereas 90 Sr 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.
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