Role of dopants in LiF TLD materials

Thermoluminescence (TL) in LiF was found to depend on the use of proper combination of the dopant ions and the optimised preparation procedure. LiF doped with Mg,Cu,Si exhibited high TL sensitivity (55 times that of TLD-100 LiF:Mg,Ti) and insignificant higher temperature glow peak leading to negligible residual TL signal. The occurrence of the dosimetric peak in LiF was found to be a strong function of Mg dopant. The peak temperature and the TL emission spectra of dosimetric glow peak in all samples having Mg, Cu were always found to be the same irrespective of the third dopant which influenced only the intensity of TL emission spectrum. The emission band peaking at 385 nm was assigned to Cu.