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A number of discrepancies appear in the published values for the cross sections for the elastic scattering of high energy gamma rays. A direct method, using a scintillation spectrometer, has therefore been developed to measure the cross section for elastic scattering in terms of the Compton cross section. This has been done for energies of 0.411, 0.66, 1.17 MeV at an average scattering angle of approximately 80° in lead, tin, copper and mercury. The cross sections are in agreement with classical prediction in these elements for 0.411 and 0.66 MeV photons. The existence of Delbruck scattering is suggested in the case of 1.17 MeV scattering from lead.
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J R Cook (1955) studied this question.
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