Measurements of Low-Voltage X Rays (Chaoul Technique)

Abstract

An account is given of measurements of X rays produced at 60 K.V. and used at small (5 cm. and 3 cm.) focal skin distances. A new type of distribution dosage-rate meter is described, suitable for such work. Spectroscopic and absorption measurements of “quality” give an average wavelength of about 0·32 Å. The X-ray output of such apparatus is such that at 5 cm. f.s.d. the dosage rate is about 25 r/min. ma. Investigations are described of back-scatter, percentage depth dose and complete distribution of radiation. The results of measurements of stray radiations are also recorded. Some theoretical possibilities of mathematical study of the dosage distribution problem are indicated.