Intercomparison of North American Radon progeny measurement methods and equipment

Twelve laboratories from the Western United States and Canada participated in radon progeny intercomparison measurements at the U.S. Bureau of Mines radon calibration facility in March 1987. The participants intercompared grab-sampling and automated equipment methods at high and low concentrations of radon progeny and condensation nuclei. The objective of this intercomparison was to determine if the measurement procedures and equipment of the North American facilities are equivalent. The sampling results show good agreement among all participants. The standard deviation for the working level measurements was less then 3.5 pct for 1.70 working level (WL) and less than 8.8 pct for 0.21 WL