Abstract
The clinical application of low voltage X rays, produced by the beryllium window tube, is described. The types of lesions treated, the dosage levels used and the resulting reactions are given with the warning that the prescription must be carefully worded as errors might be serious, owing to the very high dose-rates. The quality of the beam used is referred to in terms of absorption in tissue (H.V.D.) since this is directly applicable to clinical practice and forms part of each prescription. The advantages of this form of low voltage X-ray therapy are (1) the ability to choose X rays from a wide range of quality, and (2) the very high dose-rates.

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