X-Ray Diffraction Effect Shown by some Specimens of Chrysotile

Abstract

IN a study of the ‘tailed‘spots occurring on X-ray fibre photographs of chrysotile a camera with a slit approximately 0·7 cm. high was used, so that nearly 1 cm. of the fibre Was irradiated. The purpose was to obtain lines instead of spots in the X-ray photograph, and thus facilitate photometry. The lines obtained, however, Were beaded, the effect being particularly evident with specimens from Barberton (Figs. A and B). A specimen from Thetford showed only a slight variation in intensity along the lines (Fig. C), and a Russian specimen showed no visible variation. The effect can be imitated to some extent by pinching at regular intervals a specimen not showing it (Fig. D).