Developments in the synthesis of LiF:Mg,Cu,Na,Si TL Material

Abstract

A procedure for synthesis of the highly sensitive pellet-type LiF:Mg,Cu,Na,Si thermoluminescent (TL) detector has been newly developed. It was found that the optimum concentrations of dopants for a pellet-type LiF:Mg,Cu,Na,Si TL detector were found to be Mg: 0.2 mol %, Cu: 0.05 mol %, Na: 0.9 mol%, and Si: 0.9 mol%. The TL sensitivity of this new detector was about 30 times higher than that of the TLD-100 by light integration measurements. Reusability study of the detector was carried out for 10 cycles. The results show that the coefficients of variation for each detector separately did not exceed 0.016, and that for all 10 detectors collectively was 0.0054.

Dosimetric Properties of the Newly Developed LiF:Mg,Cu,Si TL Material

“…At that time, the relative thermoluminescence intensity of this material was only 7 times as high as that of TLD-100, much less than that of LiF:Mg,Cu,P. Last few years, the main features of LiF:Mg,Cu,Na,Si as KLT-300 (KAERI LiF:Mg,Cu,Na,Si TL detector) had been improved significantly [6], which possesses high sensitivity and good reusability. But the main drawback of the KLT-300 is that the glow curve shape and TL sensitivity decreased significantly when annealed at temperatures above 245 o C. So there is a need to develop a new TL material with the useful properties of LiF:Mg,Cu,P but having a lower residual signal and a better stability to heat treatment.…”