Measurement of airborne artificial activity concentrations in the presence of natural radionuclides requires reliable subtraction of the natural contribution and precise calibration. Therefore the commercially available aerosol monitor LB 150D-R was dynamically calibrated at the ICARE facility of the IPSN/CEA in Saclay, France. Aerosols labelled with /sup 239/Pu with mean aerodynamic diameter of 0.4 /spl mu/m and 4 /spl mu/m had been generated and isokinetically sampled by the aerosol monitor. The response to /sup 239/Pu activity concentrations and detection limits in the presence of Radon progeny had been determined. The retention of aerosols and their distribution on the filter was investigated using fluoresceine labelled aerosols.
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