Imperial College London

Professor WE (Bill) Lee FREng

Faculty of EngineeringInstitute for Security Science & Technology

Co-Director of Institute for Security Science and Technology
 
 
 
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Contact

 

+44 (0)20 7594 6733w.e.lee Website

 
 
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Assistant

 

Ms Denise McGurk +44 (0)20 7594 8864

 
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Location

 

Central LibrarySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pankov:2005,
author = {Pankov, AS and Ojovan, MI and Lee, WE and Scales, CR},
journal = {Proceedings - 10th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM'05},
pages = {637--643},
title = {ION-exchange and diffusion parameters of simulant British (Magnox, 75/25 Blended waste) and Russian (K-26) glasses at 40-60°C},
volume = {2005},
year = {2005}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Simulant compositions of two British (Magnox and 75/25 Blended) nuclear waste glasses and of Russian K-26 radioactive glass were synthesized and studied to eventually evaluate the role of intrinsic gamma-irradiation on radionuclide release rates. The diffusion coefficient and activation energies of the main glass constituents' release were obtained from a series of leaching experiments over the temperature interval 40° to 60°C at neutral pH and low concentrations of dissolved species. Under these conditions ion-exchange is the main corrosion mechanism of each glass. Normalized release rates of Na, Li, Ca, B and Si were determined after 3, 15 and 27 days test duration. The cation leaching rates for K-26 glass are about an order of magnitude higher than those for both Magnox (MW) and 75/25 glasses. The normalized release rates of cations from K-26 glass at 40° after 27 days are in the range of (3.2-5.7)·10-1 g·m-2d-1 whilst for MW and 75/25 glasses these values are (1.8-3.4)·10-2 and (5.1-6.2)·10-2 g·m-2d-1, respectively. At 60°C the leaching rates increase up to (4.8-7.6) ·10-1 for K-26 glass and (5.0-8.2)·10-2 for MW glass. In most glasses sodium has a normalized release rate higher than those of the network-forming elements. SEM observation reveals an inhomogeneous microstructure in all glasses examined. MW and 75/25 glasses are characterized by segregation of two glassy phases. K-26 glass contains crystalline inclusions although only in small amounts. Surface changes originating from interaction with water have been studied using SEM techniques. K-26 and MW glasses e.g. show formation of altered (secondary) surface layers. Copyright © 2005 by ASME.
AU - Pankov,AS
AU - Ojovan,MI
AU - Lee,WE
AU - Scales,CR
EP - 643
PY - 2005///
SP - 637
TI - ION-exchange and diffusion parameters of simulant British (Magnox, 75/25 Blended waste) and Russian (K-26) glasses at 40-60°C
T2 - Proceedings - 10th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM'05
VL - 2005
ER -