DIFFUSION OF URANIUM IN RHENIUM DETERMINED BY SOLID STATE NUCLEAR TRACK DETECTOR

Abstract

The diffusion of uranium in rhenium has been determined by using solid state nulcear track detector. Induced thermal neutron fission tracks registered on mica detectors from diffused U-235 atoms on each side of the rhenium have been counted. Diffusion process was carried out in a vacuum bell-jar at 10−4 torr pressure range. Uranium was doped on the front side of a stack of rhenium filaments in the same vacuum belljar from a thermal ionization source. A constant d. c. current was run through the filaments to obtain the required temperature of diffusion by resistance heating. The results of diffusion in the temperature range from 1082°C to 12652°C can be expressed by the relation D = 7.89 × 1C−7 exp (− 20,560 / RT).