Record Display for the EPA National Library Catalog

RECORD NUMBER: 4 OF 18

OLS Field Name OLS Field Data
Main Title Description of a Method for Measuring the Diffusion Coefficient of Thin Films to (222)Rn Using a Total Alpha Detector.
Author Mosley, R. B. ;
CORP Author Acurex Environmental Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. National Risk Management Research Lab.
Publisher 1997
Year Published 1997
Report Number EPA-68-D4-0006; EPA/600/A-97/015;
Stock Number PB97-192892
Additional Subjects Alpha detection ; Radon 222 ; Diffusion coefficient ; Thin films ; Desorption ; Alpha dosimetry ; Membranes ; Barriers ; Passive systems ; Penetration ; Diffisivity ; Radionuclide migration ; Radioecological concentration ; Indoor air pollution ; Air infiltration ;
Internet Access
Description Access URL
https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=P100VBA8.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB97-192892 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/22/1997
Collation 14p
Abstract
The paper describes a method for using a total alpha detector to measure the diffusion coefficient of a thin film by monitoring the accumulation of radon that penetrates the film. It demonstrates that a virtual steady state condition exists in the thin film during the early stages of accumulation that allows reliable measurements of the diffusion coefficient without having to wait for the final conditions of equilibrium or having to analyze the complex transient solutions. In some cases, the final condition of equilibrium would require the measurement to last 3 or more weeks rather than 3 days.