Abstract
Substantial variations in full energies peak efficiency were observed when a 1 mm γ-ray beam of 122 keV from 57Co was directed at a series of points across the face and along the axis of an open-ended true coaxial detector. The full energy peak efficiency near the n-layer was measured to be less than 50% of that near the p-core. As the peak efficiency decreases across the intrinsic region, the continuum below the peak (0–117 keV) increases, so that the total counts in the spectrum remain essentially constant over the sensitive area. This non-uniform response is thought to be due primarily to imperfect compensation resulting in recombination and therefore incomplete charge collection.
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