Diffusion of Gases through Nickel and Design of a Convenient Leak for Hydrogen and Deuterium

Abstract

The diffusion of gases through thin-walled nickel tubing (cathode tubing) has been investigated in the temperature range 200–1000°C. It was found that at the most thoroughly examined temperature of 500°C and at a pressure difference of 1 atmos, hydrogen and deuterium diffuse through this tubing about 2000 times faster than any of the other gases tried. The design of a hydrogen and deuterium leak is described which is easy to construct and to operate. The tubing does not appear to deteriorate because of crystallization as is experienced with palladium tubing.