Invivo Silicon Detectors, Invivo Preamplifiers and Their Applications

An analysis of the conflicting parameters for the optimum design of an invivo semiconductor detector and invivo microminiature preamplifier has been made. Two forms of each have been developed for use in many medical and biological applications: One, a bullet shaped probe which permits shielding of the voltage-signal lead and operation at ground potential of all exposed surfaces; devices of 7 mm down to 3mm diameter have been made. Two, plane parallel devices which must be used when the application demands that one or more dimensions must be in the range of 1mm. The preamplifiers have dimensions of 1 mm diameter and 5 mm length and 3 mm diameter and 7 mm length. The physical and nuelear characteristics of each are presented with results of their application.