Total Attenuation Coefficients for 5- to 11-MeV Photons

Abstract
Monoenergetic neutron-capture gamma rays have been used to measure gamma-ray attenuation co-efficients of beryllium, aluminum, copper, tin, and lead at energies of 5.435, 6.405, 7.725, and 10.833 MeV. These coefficients have been obtained with uncertainties of from 0.3 to 0.5%. Results are in reasonable agreement with calculated coefficients. Analysis of the results shows that, in the energy range studied, if Compton scattering can be calculated from the Klein-Nishina formula without radiative corrections, pair production in the Coulomb field of an electron is best predicted by the theory of Borsellino.

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