The variation of resolution with gamma energy in activated alkali halide crystals

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Abstract
The intrinsic resolution of ten activated alkali halide crystals has been measured over an energy range of 30 kev to 1 Mev. After subtracting the contributions to resolution due to non-proportionality of electron response and to delta rays, a residual resolution is left which consists of an energy dependent term and an energy independent term. The existence of the energy dependent term is not in agreement with the work of Prescott and Takhar, and shows that the variance of the photons produced in the scintillation process is greater than normal. The energy dependent term is sensitive to strain and to the surface condition of the crystal.