The measurement of activity-weighted size distributions of radon progeny: methods and laboratory intercomparison studies
- Department of Chemistry, Clarkson University, Potsdam, NY (United States)
Over the past 5 y, there have been significant improvements in measurement of activity-weighted size distributions of airborne radon decay products. The modification of screen diffusion batteries to incorporate multiple screens of differing mesh number, called graded screen arrays, have permitted improved size resolution below 10 nm such that the size distributions can now be determined down to molecular sized activities (0.5 nm). In order to ascertain the utility and reliability of such systems, several intercomparison tests have been performed in a 2.4 m3 radon chamber in which particles of varying size have been produced by introducing SO2 and H2O along with the radon to the chamber. In April 1988, intercomparison studies were performed between direct measurements of the activity-weighted size distributions as measured by graded screen arrays and an indirect measurement of the distribution obtained by measuring the number size distribution with a differential mobility analyzer and multiplying by the theoretical attachment rate. Good agreement was obtained in these measurements. A second set of intercomparison studies among a number of groups with graded screen array systems was made in April 1989 with the objective of resolving spectral structure below 10 nm. Again, generally good agreement among the various groups was obtained although some differences were noted. It is thus concluded that such systems can be constructed and can be useful in making routine measurements of activity-weighted size distributions with reasonable confidence in the results obtained.
- OSTI ID:
- 6914430
- Journal Information:
- Health Physics; (United States), Vol. 63:5; ISSN 0017-9078
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
RADON
RADIATION MONITORING
DAUGHTER PRODUCTS
EXPOSURE CHAMBERS
INTERLABORATORY COMPARISONS
MINING
RADIOECOLOGICAL CONCENTRATION
ECOLOGICAL CONCENTRATION
ELEMENTS
FLUIDS
GASES
ISOTOPES
MONITORING
NONMETALS
RARE GASES
540130* - Environment
Atmospheric- Radioactive Materials Monitoring & Transport- (1990-)