Radiation Protection Dosimetry 7:159-163 (1984)
© 1984 Oxford University Press
Characterisation of Indoor Atmospheres
As part of a survey of the exposure by inhalation of 222Rn and 220Rn (thoron) daughters in the Netherlands, a characterisation of indoor aerosols is made. Particle size distributions are determined using a particle sizer, which is applicable in the particle size range of 0.01 to 1 µm. The apparatus consists of a mobility aerosol analyser, classifying the particles while the transmitted aerosol is counted by a sensitive continuous condensation nucleus counter. Some studied sources of domestic aerosols are cigarette smoke, dust of various origin and condensation nuclei originating from natural gas flames. The concentration of radon and thoron gases is measured by means of a two filter apparatus, whereas the concentration of a number of daughter products is also assessed. Some health related charateristics are hereby measured, such as potential alpha energy concentration.