Abstract
Measurements of the absorption coefficients of a variety of materials for X rays from a 500 kV continuously evacuated X-ray tube are reported. Effective wavelength values obtained from these measurements are in good mutual agreement. Backscatter and depth dose data for radiation of H.V.L. 6·3 mm. copper, and at 50 cm. F.S.D. have been obtained for a wide variety of fields, with a pressdwood phantom. The shortcomings of the use of closed applicators, and of pressdwood as a phantom material are indicated. A “stepped” aluminium filter to give a constant output for all working positions of the X-ray port is described.
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