Gamma-Ray Absorption Coefficients

In the early period of X-ray research, the radiation sources were discharge tubes with applied potentials well below 100 key. X rays from these sources interact with matter primarily through the photoelectric effect. Their penetration is then limited by photoelectric absorption and is adequately described by an exponential law.

Penetration and Diffusion of X Rays

Mathematical theory of radiation fields

Some typical problems of the propagation of gamma-radiation in an extended scattering medium have been solved for pure Compton scattering, which is a good approximation for most materials at gamma-ray energies up to a few MeV. The effects to be expected from air gaps round the source, large source dimensions, and plane absorbing materials are demonstrated.

R. E. Weir

Papers

The scattering of gamma-rays in extended media. iii. problems with spherical symmetry