Abstract
The recent development of the production of radioactive isotopes has given rise to a number of new techniques which may be applied in several fields of science, especially medicine, biology, chemistry, and mechanics. The study of wear by friction is a very good field for applying radioactivation techniques. Several investigations have been made on gear wear, ram wear, and so on. In these studies, one of the abrading members is radioactive and the products of its wear may be located in the lubricant. In the study of dry friction, e.g, in cylinders, automobile tires, tools, etc., the radioactive particles may be found on the unactivated member. In this paper a particular application is explained—namely, the wear of a die face during the hot extrusion of steels.
