Investigations have been carried out on the use of semiconductor cadmium sulphide crystals as a means of measuring radiation intensity. A number of the properties of these crystals under d.c. conditions are reported and are found to be consistent with the model for photo-conductivity as suggested by Rose in which the distribution of trapping depths for the conduction electrons is exponential. Suitable crystals have been mounted in probes and hypodermic needles for use in intracavitary and interstitial measurements. A description of these measuring systems and information on the interpretation of readings obtained in terms of dose received under differing conditions of radiation quality are given.
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Mauldon et al. (1956) studied this question.
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