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Submitted on: 13 March 2001.
Revised on: 14 June 2001.
Accepted on: 24 July 2001.
___________________Journal of Nuclear Materials---ELSEVIER
Submitted on: 27 September 2012.
Revised on: 19 November 2012.
Accepted on: 13 December 2012.
___________________Journal of Nuclear Materials---ELSEVIER
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Submitted on: 13 March 2004.
Revised on: 10 April 2004.
Accepted on: 01 June 2004.
___________________Journal of Nuclear Materials---ELSEVIER
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