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Effective absorption cross sections of the x-rays exciting the well-known Cu 63 (y,w)Cu 62 reaction have been measured in a number of elements. In agreement with other workers, the experimental cross sections have been found to be lower than those predicted by theory by a fraction roughly proportional to Z 2 , which amounts to about 10 percent for Pb. By using the results of these measurements as a standard, the effective energies, with Pb absorbers, of the x-rays exciting the C 12 (-y,#)C u , Mo 92 (7,w)Mo 91 , and Ag 107 (7,w)Ag 106 reactions have been found to be 26.0±1.4, 17.0±1.0, and 16.1±0.9 Mev, respectively, in good agreement with resonance peak energies obtained by more elaborate methods.

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