Abstract
The design and operation of a mobile counting system incorporating a Geiger counter are described. The instrument reads directly all counting rates up to 1000 periodic impulses per second, and correction graphs are drawn for the losses sustained when random impulses are counted. The instrument is calibrated in terms of tolerance dose-rate (T.D.R.) for the γ rays of radium and for 200 kV X rays. For radium γ rays, full scale deflection corresponds to about 1 T.D.R., while for X rays it is only about 0·4 T.D.R. Results of stray radiation measurements carried out in the teleradium treatment room (containing 1 gm. and 10 gm. teleradium units), and the floors beneath it, and also in the X-ray Therapy and Diagnostic Departments, are presented. A brief description of the use of the instrument in measuring activities in various parts of a patient's body after the administration of radio-iodine, is also given. Instruments of similar design may be widely used in the future for work of this nature.
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