| 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 |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB97-192892 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| 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. |
| Supplementary Notes |
Presented at the International Radon Symposium, Haines City, FL., September 29-October 2, 1996. Sponsored by Environmental Protection Agency, Research Triangle Park, NC. National Risk Management Research Lab. |
| Availability Notes |
Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)321-8547; and email at orders@ntis.fedworld.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| NTIS Title Notes |
Rept. for Jun-Sep 96. |
| Category Codes |
68F; 68A; 77G; 77E; 89B |
| NTIS Prices |
PC A03/MF A01 |
| Primary Description |
600/13 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
731601110 |
| Origin |
NTIS |
| Type |
CAT |
