Borosilicate glass was irradiated with a high dose of gamma rays from a cobalt-60 source. After irradiation the glass was heated while a temperature gradient was maintained between its surfaces. During the heating an external current was observed. The direction of the current in the dielectric corresponded to a transport of negative charge to the electrode with the higher temperature.

• Received 2 December 1957

DOI:https://doi.org/10.1103/PhysRev.110.337