Polarization Phenomena in CdTe Nuclear Radiation Detectors
- 1 February 1974
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Nuclear Science
- Vol. 21 (1), 322-330
- https://doi.org/10.1109/tns.1974.4327478
Abstract
Nuclear radiation detectors made from high resistivity chlorine doped cadmium telluride grown by the travelling heater method were evaluated. Short term performance for α, ß, and γ radiations was good but the long term performance (>1 min) was degraded by a decrease in the full energy pulse height and γ-ray efficiency with time after the bias voltage was applied. A model which considers the effects of deep acceptors which slowly ionize (~103 s) to an equilibrium concentration ~5 × 1011/cm3 can explain the experimental findings on the changes of pulse shape, pulse amplitude, capacitance, energy resolution, and γ-ray efficiency with time. The operating conditions required for satisfactory stability in these detectors may be inconvenient to the user.Keywords
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