Abstract
The effects of fast neutron bombardment on Ge(Li) gamma-ray detectors have been investigated at neutron energies of 1.10, 5.75 and 16.49 MeV. Measurements were made of reverse leakage current, capacitance, rise-time, energy resolution, and pulse-height decrease as a function of neutron dose. A degradation of energy resolution was the most notable effect and occurred for each energy after approximately 10 10 n/cm 2. Experiments with a collimated gamma-ray source show that the degradation in energy resolution is due primarily to hole trapping. Calculations were made of the total number of defects produced by the bombardment of 1.2×10 11 n/cm 2 at 1.10 MeV and a value of 1.3×10 13 defects/cm 3 is estimated. Some rougher estimates were made at the other energies. Procedures and results obtained in processing two detectors after irradiation are described. The detector irradiated at 16.49 MeV was restored by redrifting at ∼30°C.
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