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H.A Schuessler
Department of Physics, Texas A&M university, College Station, TX 77843, U.S.A
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E.C Benck
Department of Physics, Texas A&M university, College Station, TX 77843, U.S.A
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F Buchinger
Forst Radiation Laboratory, McGill University, Montreal, Canada H3A 2B
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H.K Carter
UNISOR, Oak Ridge, Associated Universities, Oak Ridge, TN 37831, U.S.A