Verification of a method for determination of tritiated water in ambient air
Objective To experimentally verify the precision and accuracy of determining tritiated water in ambient air using the desiccant adsorption sampling-high temperature negative pressure desorption of liquid water(containing HTO)-li-quid Scintillation counter method,and to provide technical support for developing standard methods for monitoring tritiated water in ambient air.Methods The relative standard deviation and recovery of multi-group samples were verified by col-lecting,testing,and analyzing environmental samples with different activity concentrations.The uncertainty of the method was evaluated,the main uncertainty components were identified,and the reliability of measurement results was analyzed.Through experimental comparison of different methods,the differences in the test results of different methods were ex-amined.Results The relative standard deviation of multiple samples ranged from 6.7％to 7.9％,the recovery ranged from 95.7％to 97.3％,and the uncertainty was greatly affected by the sample counting rate,with no significant difference as com-pared to condensation sampling method.Conclusion The precision and accuracy of this method meet the requirements of environmental authorities for monitoring tritiated water in ambient air,and it can be widely used in the monitoring of triti-ated water in ambient air.
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