THE EFFECT OF HYDROSTATIC PRESSURE ON THE LOW-TEMPERATURE THERMO LUMINESCENCE OF NaCl

摘要

low-temperature glow curve of NaCl is measured. It is found that one glow peak is enhanced by pressure in the range of conditions studied. It is proposed that this enhancement is caused by the production and movement of dislocations within the crystal lattice. This movement creates vacancies and interstitials which will affect the luminescence.nThe experimental procedure consists of irradiating single crystals of NaCl with a cobalt-60 source at liquid nitrogen temperature. After irradiation, the crystal is heated and the subsequent glow is recorded by a photomultiplier tube. The crystal is then pressed hydrostatically for a period of time, and the above procedure is repeated. A comparison is made between the glow curves obtained before and after pressing the crystal to determine what effect pressure has on the luminescence.