An International Marine-Atmospheric ' Measurement Intercomparison in Bermuda Part II: Results for the Participating Laboratories

摘要

As part of an international measurement intercomaprison of instruments used to measure atomspheric ~222 Rn. Four participating laboratories made nearly simulta-neous meausremts of ~222Rn activity concentration in commonly sampled, ambient air over approximately a 2, week period, and three of these four laboratories participated in the meausrement comparison of 14 introduced samples with knowen, but undiscolosed (blind) Rn activity concentration. The exercise was conducted in Bermuda in october 1991. The ~222 Rn activity concentrations in ambient Bermudian air over the course of the intercomaprison ranged from a few hundredths of a Bq, while the standardized sample additions covered a range from appximately 2.5 Bqm!-3 to 35 Bqm~-3. The overall uncertainty in the latter concentrations was in the general range of 10%, approximating a 3 standard deviation uncertainty interval.