Interlaboratory comparisons for passive radon measuring devices at BfS

Since 2003, the German Federal Office for Radiation Protection (BfS) has conducted annual interlaboratory comparisons for passive radon measuring devices in order to ensure the quality of these measurements. Passive radon devices which use solid state nuclear track detectors, electrets or activated charcoal can be tested. The exposures of radon devices are carried out in the radon calibration laboratory at BfS. Radon activity concentrations are traced back to the national standard, being established at the National Institute of Physics and Metrology (PTB). According to the national guideline, radon services which offer radon monitoring at workplaces have to participate in the intercomparisons and prove the suitability of their radon devices for the measurements.