The development and field testing of a system for determination of ultrafine activity particle size distribution and working levels: Technical progress report, April 1, 1988-August 31, 1988
Recent investigations of radon decay products in indoor air have shown that what has been called the /open quotes/unattached/close quotes/ 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 is being constructed for subsequent field testing. In addition, calculational studies have been made to optimize the selection of flow and screen parameters to permit the most complete and accurate reconstruction of the activity size distribution from a limited number of measurements. The results of these studies are presented in this report. 38 refs., 2 figs.
- Research Organization:
- Illinois Univ., Urbana (USA)
- DOE Contract Number:
- FG02-88ER60669
- OSTI ID:
- 6844428
- Report Number(s):
- DOE/ER/60669-1; ON: DE88014985
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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The development and field testing of a system for determination of ultrafine activity particle size distribution and working levels
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AEROSOLS
MATHEMATICAL MODELS
INDOOR AIR POLLUTION
RADIATION MONITORING
DESIGN
DETECTION
DOSE EQUIVALENTS
FORECASTING
HISTORICAL ASPECTS
OPTIMIZATION
PARTICLE SIZE
POLONIUM 218
PROGRESS REPORT
RADON 222
SAMPLING
AIR POLLUTION
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COLLOIDS
DAYS LIVING RADIOISOTOPES
DISPERSIONS
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EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
MINUTES LIVING RADIOISOTOPES
MONITORING
NUCLEI
POLLUTION
POLONIUM ISOTOPES
RADIOISOTOPES
RADON ISOTOPES
SIZE
SOLS
320107* - Energy Conservation
Consumption
& Utilization- Building Systems- (1987-)