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Stabilisation of X-ray Therapy Apparatus by Ionization Current

Newcastle Regional Radiotherapy Centre, Royal Victoria Infirmary, Newcastle upon Tyne

This excerpt was created in the absence of an abstract.

An instrument is described which keeps the output of an X-ray therapy tube constant within 1 or 2 per cent. over long periods. The current from an ionization chamber in the tube aperture is amplified and used to operate a relay which controls a regulating transformer in the main power supply line and so corrects variations of output in either direction. Automatic return of the transformer tapping to its mid point, on switching off the X-ray unit, is incorporated.