Improving the validity of wire screen unattached fraction Rn daughter measurements
Wire screens are commonly used to estimate unattached Rn daughter fractions in ambient and mine atmospheres. However, it is now recognized that the unattached fraction is in reality an ultrafine cluster mode in the 0.5-3 nm size range and that the collection efficiency versus particle diameter characteristics of wire screens do not permit a distinct separation of the unattached and attached fractions. Wire screen penetration theory and a semi-empirically corrected diffusion coefficient equation are used to characterize unattached fraction measurements as a function of experimental parameters. Collection efficiency curves are estimated for previously published wire screen unattached fraction measurements, and improvements in wire screen methods for such measurements are discussed.
- Research Organization:
- Univ. of Illinois at Urbana-Champaign (USA)
- OSTI ID:
- 6281570
- Journal Information:
- Health Phys.; (United States), Journal Name: Health Phys.; (United States) Vol. 56:2; ISSN HLTPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
COLLOIDS
DAUGHTER PRODUCTS
DIFFUSION
DISPERSIONS
EFFICIENCY
ELEMENTS
FILTRATION
FLUIDS
GASES
ISOTOPES
MEASURING METHODS
NONMETALS
RADIOACTIVE AEROSOLS
RADON
RARE GASES
SCREENS
SEPARATION PROCESSES
SOLS
TESTING
VALIDATION