Abstract
A scheme has been developed for presenting the geometrical specifications of focused collimators and their physical properties for scanning extended sources. The performance of a collimator is described by its plane-source sensitivity (which is nearly independent of the source-to-collimator distance), its central axis depth response, and its spatial resolution as a function of depth for a given γ-ray energy. All three parameters are derived from a set of line-source measurements in air. An analysis of the line-source response determines the septum penetration for the selected γ-ray energy. For sources in an absorbing medium, the depth response of the collimator must be modified by an experimentally determined γ-ray attenuation coefficient while the resolution of the collimator remains unchanged.
Published Version
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