Abstract
A report is given on some measurements of the Rayleigh cross section for scattering of 0.41 MeV. gamma-rays by lead, copper and aluminium. At smal langles the Rayleigh cross section in lead is found to decrease rapidly with increasing angle of scattering from approximately 12 times the Compton cross section at 3° to a value equal to the Compton cross section at 12°. In copper the Rayleigh cross section is found to equal the Compton cross section at 4.5°. In aluminium no substantial excess scattering above the Compton cross section is found, the smallest angle at which measurements were taken being 3°. At 60°, 90°, 120° and 150° the hard component of the scattered radiation from lead is found to be respectively 1.77, 1.14, 0.88 and 0.66% of the Compton component as calculated by the Klein-Nishina formula.
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