Nanoaerosols including radon decay products in outdoor and indoor air at a suburban site

Nanoaerosols have been monitored inside a kitchen and in the courtyard of a suburban farmhouse. total number concentration and number size distribution (51000nm) of general aerosol particles,as measured with a grimm aerosol smps+c 5.400 instrument outdoors,were mainly influenced by solar radiation and use of farming equipment,while,indoors,they were drastically changed by human activity in the kitchen. in contrast,activity concentrations of the short-lived radon decay products 218po,214pb,and 214bi,both those attached to aerosol particles and those not attached,measured with a sarad eqf3020-2 device,did not appear to be dependent on these activities,except on opening and closing of the kitchen window. neither did a large increase in concentration of aerosol particles smaller than 10 or 20nm,with which the unattached radon products are associated,augment the fraction of the unattached decay products significantly. copyright © 2012 mateja smerajec and janja vaupoti.