Abstract
When undertaking intracavitary irradiation of the uterus and cervix in patients with gynaecological cancer it is of the utmost importance to know what dosage the surrounding normal tissue will receive from the radioactive sources whilst they are in situ. It is therefore necessary to have some accurate and quick method of checking the radiation dosage to the rectum and bladder whilst the patient is anaesthetised in the operating theatre (Lederman, 1950); if the measured dose-rates are too high the radioactive material can be removed and reinserted with fresh packing. In order to perform such measurements a dose-rate meter is required of convenient shape and size, giving a faithful (and preferably linear) indication of dose-rate at the position of the probe, and ideally having a fast response which is independent of the temperature of the detector and the quality of the radiation field.
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