Dependence of Glow Curve Structure on the Concentration of Dopants in LiF:Mg,Cu,Na,Si Phosphor

The dependence of dopants concentration on glow curve structure of newly developed LiF:Mg,Cu,Na,Si phosphor has been investigated. LiF samples with different dopants concentration were prepared by varying the concentrations of Mg (0-1.0 mol%), Cu (0-1.0 mol%) and NaSi (0-2.4 mol%) and their glow curve shapes were analysed after 137Cs γ irradiation. The intensity of the main peak has a strong influence on Mg concentration. The intensity of the high temperature peak tends to be reduced with increasing Cu concentration; Cu inhibits the growth of the high temperature peak. NaSi was an effective dopant to obtain the high intensity of the low temperature peak and main peak. The optimum composition of dopants was found to be Mg 0.6 mol%, Cu 0.8 mol% and NaSi 1.8 mol%. This phosphor has about two times higher sensitivity than that of LiF:Mg,Cu,P. (author)