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Unformatted text preview: Si(Li), or CZT for (a) lOOkeV gamma rays, and (b) for IMeV gamma rays? Justify your answer. Solution: The fullenergy peak efficiency is the probability an incident gamma ray will interact in the crystal and also deposit all its energy in the crystal (i.e., no secondary radiation escapes). Thus, the efficiency is the product of (1) the probability Pint the gamma ray interacts at all and (2) the probability Pdep that the interaction leads to total energy deposition in the crystal. The probability of interaction is Pint ~ 1 eIJ.X where x is the crystal thickness and JL the total interaction coefficient. July 24, 2002...
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 Spring '06
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