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Submitted on: 06 May 1999.
Revised on: 30 July 1999.
Accepted on: 27 August 1999.
___________________Journal of Radiation Research and Applied Sciences
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Submitted on: 21 January 1999.
Revised on: 16 April 1999.
Accepted on: 04 June 1999.
___________________Journal of Radiation Research and Applied Sciences
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Submitted on: 22 October 2005.
Revised on: 13 November 2005.
Accepted on: 30 November 2005.
___________________Journal of Radiation Research and Applied Sciences