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Abstract
In a superficial X-ray therapy unit, the Dermopan, recently installed at this hospital, an unexpected relationship was observed between X-ray output and tube current when the latter was varied from the specified value at the 10 kV setting. It is thought worth while to record this observation, since failure to appreciate this behaviour could lead to serious errors in dosage. It will also be seen that, by means of a simple adjustment of the control circuit of the machine, this characteristic can be turned to good account by providing improved dose control. The equipment uses a self-rectified tube with a beryllium window. A selector switch on the control panel provides for operation at 10, 29, 43 or 50 kVp. An electrical interlock system ensures that the tube can be energised only when the filter appropriate to the selected kilovoltage is in place. A fine control of line voltage is provided. A tube current of precisely 25 mA is specified at all four X-ray qualities. Tube current control is smooth and adequat...
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