CADMIUM TELLURIDE DETECTORS FOR GAMMA DOSE-RATE METERS

Authors
  1. McGowan, S.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
The response of a 0.25-mm CdTe detector has been calculated for photon energies ranging from 0.06 to 5.0 MeV using the computer code CYLTRAN. Results show that the response is highly energy dependent, varying by almost three decades over this energy range. The response also depends significantly on the amount of scattering material adjacent to the detector. Some additional calculations show that the response can be made more uniform by using a lead/tin filter and by employing more than one energy-discrimination level, but good uniformity of response is difficult to achieve. At 2 MeV a response of 2.1 x E7 counts/(square mm gray) was found which is essentially the same as for silicon of equivalent thickness. Measurements with a commercial CdTe detector confirmed the results of the calculations, although comparison of measured and calculated results indicated that the detector was not as thick as its specified 0.25 mm.
Report Number
859 —
Date of publication
15 Mar 1982
Number of Pages
25
DSTKIM No
83-01795
CANDIS No
39642
Format(s):
Hardcopy;Originator's fiche received by DSIS

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