U.S. Department of EnergyOffice of Scientific and Technical Information
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
Abstract
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. Themore »
- Authors:
- Publication Date:
- Research Org.:
- Illinois Univ., Urbana (USA)
- OSTI Identifier:
- 6844428
- Report Number(s):
- DOE/ER/60669-1
ON: DE88014985
- DOE Contract Number:
- FG02-88ER60669
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 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; DOCUMENT TYPES; 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-)
Citation Formats
Hopke, P K. 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. United States: N. p., 1988.
Web.
Hopke, P K. 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. United States.
Hopke, P K. 1988.
"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". United States.
@article{osti_6844428,
title = {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},
author = {Hopke, P K},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6844428},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}