Dependence of thermoluminescence in LiF : Mg,Cu,Na,Si phosphor on Na dopant concentration and thermal treatment

摘要

A new phosphor, LiF:Mg,Cu,Na,Si, has been developed in this laboratory for thermoluminescence. The thermoluminescence dependence on the concentration of Na dopant between 0 mol% and 0.45 mol% and thermal treatment between 240degreesC and 310degreesC was investigated. With an increase of Na concentration, the TL sensitivity and the main peak increase when the annealing temperature is less than 300degreesC. With an increase of annealing temperature, the position of the main glow peak shifts markedly towards higher temperatures, irrespective of Na concentrations. The height of the main peak depends strongly on the annealing temperature. TL sensitivity remains stable at annealing temperatures from 260degreesC to 300degreesC for 0 mol% Na concentration, from 250degreesC to 300degreesC for 0.05 mol% Na concentration, from 260degreesC to 290degreesC for 0.1 mol% Na concentration, from 260degreesC to 280degreesC for 0.2 mol% Na concentration, from 250degreesC to 270degreesC for 0.35 mol% Na concentration, or from 2600,C to 280degreesC for 0.45 mol% Na concentration. The ratio of the intensity annealed at 310degreesC to the intensity annealed at 260degreesC seems to be reduced with an increase of Na concentration. Thermal susceptibility of LiF:Mg,Cu,Na,Si appears to be associated with the Na concentration. The lower the Na concentration, the less sensitive the TL is to annealing temperature. The optimum Na dopant concentration was found to be 0%. (C) 2003 Elsevier Science Ltd. All rights reserved. [References: 15]