A Digital Dosemeter and Controller

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Abstract
An integrating dose-meter system is described which terminates an X-ray treatment exposure after a pre-set dose of radiation, as measured by an ionization chamber placed between the tube and the patient. Details of the construction of an aluminium ionization chamber, which has proved more reliable than chambers made of Perspex, are given. The integrating process, including the discharge, is carried out electronically using a cold cathode trigger tube, and the mechanical counting is carried out by a chain of single digit counters which have previously been pre-set by means of electrical push-buttons to a figure calculated from the prescribed dose. The counters count down to zero and then terminate the exposure.

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