The development and field testing of a system for determination of ultrafine activity particle size distribution and working levels: Final report
Recent investigations of radon decay products in indoor air have shown that what has been called the ''unattached'' fraction is in fact an ultrafine size aerosol with diameters in the range of 0.5 to 10 nm. There are a number of difficulties in characterizing particles in this size range. Classical diffusion batteries using screens with high mesh numbers do not have the resolution to give detailed information for the ultrafine range. The use of single screens of differing mesh numbers (Graded Screen Arrays) either in parallel or in a stacked configuration can be used to provide these results. However, accurately measuring the activity directly attached to the screens is difficult because of the attachment of some activity to the back side of the screen and the distribution of activity around the individual screen wires. A continuous monitoring system that would provide information on both the size and charge distributions on these important size range particles has been constructed and its behavior characterized in the laboratory. It is now ready for field testing, after which it will be available to fully assess the exposure of individuals to radon progeny in the indoor environment. 28 refs., 7 figs, 2 tabs.
- Research Organization:
- Illinois Univ., Urbana, IL (USA). Inst. of Environmental Studies
- DOE Contract Number:
- FG02-88ER60669
- OSTI ID:
- 5979045
- Report Number(s):
- DOE/ER/60669-3; ON: DE89014864
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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