Abstract
The differential cross-sections for the Compton scattering of 279 keV gamma photons by L-shell electrons of thorium have been measured by the coincidence technique. The angular dependence of the cross-section due to L-shell electrons is compared with the Klein-Nishina cross-section for electrons which are initially free and stationary. The experimental bound-to-free electron Compton cross-section ratio converges to zero as the scattering angle decreases to zero and approaches unity at about 150°. The value of the total Compton cross-section ratio is less than unity, indicating the effect of binding due to L-shell electrons.
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