| Main Title |
Exact Solution for the Assessment of Nonequilibrium Sorption of Radionuclides in the Vadose Zone. |
| Author |
Drake, R. L. ;
Chen, J. S. ;
Jewett, D. G. ;
|
| CORP Author |
National Risk Management Research Lab., Ada, OK. ;Dynamac Corp., Ada, OK. |
| Publisher |
Feb 2002 |
| Year Published |
2002 |
| Stock Number |
PB2003-102102 |
| Additional Subjects |
Radionuclides ;
Radioactive waste disposal ;
Radionuclide migration ;
Underground disposal ;
Assessments ;
Impacts ;
Vadose zones ;
Nonequilibrium sorption ;
HYDRUS Code
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB2003-102102 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
28p |
| Abstract |
In a report on model evaluation, the authors ran the HYDRUS Code, among other transport codes, to evaluate the impacts of nonequilibrium sorption sites on the time-evolution of (sup 99)Tc and (sup 90)Sr through the vadose zone. Since the authors' evaluation was based on a rather low, annual recharge rate, many of the numerical results derived from HYDRUS indicated that the nonequilibrium sorption sites, in essence, acted as equilibrium sorption sites. To help explain these results, the authors considered a 'stripped-down' version of the HYDRUS system. This 'stripped-down' version possesses two dependent variables, one for the radionuclides in solution and the other for the radionuclides adsorbed to the nonequilibrium sites; and it possesses constant physical parameters. The resultant governing equation for the radionuclides in solution is a linear, advection-dispersion-reaction (i.e., radioactive decay) partial differential equation containing a history integral term accounting for the nonequalibrium sorption sites. It is this 'stripped-down' version, which is the subject of this paper. |
| Supplementary Notes |
Prepared in cooperation with Dynamac Corp., Ada, OK. |
| Availability Notes |
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| Category Codes |
77G; 68F; 97Q |
| NTIS Prices |
PC A03/MF A01 |
| Primary Description |
600/15 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
010501100 |
| Origin |
NTIS |
| Type |
CAT |
