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Measurements are reported for the differential cross sections for Compton scattering of 1.12 MeV gamma rays by the K -shell electrons of tin, tantalum, gold, and thorium. A few discrepancies between approximate theoretical calculations and the experimental results for different energies are pointed out. The need for an exact relativistic calculation is indicated.

Theoretical and experimental Compton scattering cross sections at 1.12 MeV in the case of strongly bound K-shell electrons