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Simple and rapid method of checking the output of superficial X-ray and grenz-ray therapy machines

Physics Department, Plymouth General Hospital, Plymouth

This excerpt was created in the absence of an abstract.

A number of superficial X-ray and grenz-ray therapy machines in radiotherapy departments are in use which are neither equipped with an integrating dosemeter nor have a dose-rate monitor fitted into the tube housing. Such machines, according to para. 4.1.22 (ii) of the current Code of Practice (1964), require the installation of a device with which the radiographer can make daily checks of the output. Such a device should be very simple and rapid in use, robust and reliable. Only a modest degree of accuracy and sophistication in ionisation chamber design and electronic circuitry is indicated. A system for achieving these requirements is described which is inexpensive and will commend itself to those radiotherapy departments having limited technical resources.