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Submitted on: 24 November 2008.
Revised on: 28 January 2009.
Accepted on: 20 February 2009.
___________________JOURNAL OF RADIATION RESEARCH---OXFORD UNIV PRESS
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Submitted on: 12 January 2003.
Revised on: 23 February 2003.
Accepted on: 22 March 2003.
___________________JOURNAL OF RADIATION RESEARCH---OXFORD UNIV PRESS
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Submitted on: 01 September 2003.
Revised on: 22 December 2003.
Accepted on: 03 February 2004.
___________________JOURNAL OF RADIATION RESEARCH---OXFORD UNIV PRESS
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