Beam quality determinations for a 2-Mvp resonance type x-ray generator.

Abstract

The predominance of forward scattering for high-energy electromagnetic radiation (1) led us to consider the effects of introducing large amounts of absorbing material in the path of such beams. A quantity of particular interest is the measured value of the half-value layer or effective energy of the beam. When large amounts of high density material, such as lead are traversed, considerable Compton scattering results. With passage through additional thicknesses of absorbing layer, both primary and scattered radiations will undergo further scattering. As this process proceeds, the high-energy end of the spectrum is continually reduced in energy. With increasing absorber thickness, the proportion of such scattering occurring at angles large enough to remove significant amounts of this radiation from the useful beam is augmented. In a situation where the distance between absorbers and the point of observation is great, it is conceivable that the experimentally determined transmission curves will decrease too ...