Open AccessThe emission and transmission of Röntgen rays
Author(s) -
G. W. C. Kaye
Publication year - 1908
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1908.0089
Subject(s) - cathode , optics , window (computing) , ionization , physics , aluminium , atomic physics , materials science , chemistry , ion , quantum mechanics , computer science , metallurgy , operating system
A Röntgen ray tube was designed with an anticathode which consisted of a’ number of elements mounted on a small car. By means of an external magnet the car could be moved, and any element desired brought under the beam of cathode rays. The Röntgen rays produced (by a coil discharge) passed out through a thin aluminium window, and their intensity was measured by an ionisation method. Some twenty elements were used as anticathodes, and the effects upon their radiations of a number of different metal screens were investigated. The results of the work give rise to the following conclusions:— 1. The relative intensities of the radiations as they issue from the window of the tube, unobstructed by any screen, do not follow the order of the atomic weights of the anticathodes. The order shows agreement with that given by Starke for the relative numbers of cathode rays returned by metallic reflectors. The intensities indicate a grouping of the elements which agrees with, and in features is similar to, that arrived at by Barkla and Sadler from a consideration of the secondary Röntgen rays.