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A formula for the photoelectric absorption cross section for the K shell is derived using the Furry or Sommerfeld-Maue approximate wave function. The surviving terms at the high-energy limit are given explicitly and the value for the cross section is found for Pb by numerical integration. The exact wave function is rewritten so as to simplify the derivation of the Furry approximation.
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R. Boyer (1960) studied this question.
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