Study of a new Lif:Mg,Cu,P formulation with enhanced thermal stability and a lower residual TL signal

Influence of sintering temperatures on LiF:Mg,Cu,P with various magnesium concentrations

“…The relative height of the low-temperature peaks increases and the main peak, high-temperature peaks and residual signals are reduced with increasing Cu concentration in the range of 0.02e0.05 mol% and the sintering temperature (Tang et al, 1999). The height of the hightemperature peaks for HMCP is lower than that for GR-200A, and the low-temperature peaks for HMCP are higher than those for GR-200A (Tang et al, 2007). In order to achieve the purpose in this work, a higher sintering temperature and lower concentrations of Cu than those of HMCP should be used.…”

“…Both TLD of LiF:Mg,Cu,Si and HMCP can be heated above 240 C (Lee et al, 2006;Tang et al, 2007Tang et al, , 2012. The shape of the HMCP glow curve shows minimal differences for annealing in the range from 250 to 270 C and the TL readout value remained stable (Tang et al, 2007). The shape of the glow curve of LiF:Mg,Cu,Si annealed between 260 C and 290 C shows minimal difference and the variation of TL response is within 5% (Tang et al, 2012).…”

“…This new TL material also can be heated to higher temperatures. Both TLD of LiF:Mg,Cu,Si and HMCP can be heated above 240 C (Lee et al, 2006;Tang et al, 2007Tang et al, , 2012. The shape of the HMCP glow curve shows minimal differences for annealing in the range from 250 to 270 C and the TL readout value remained stable (Tang et al, 2007).…”

“…It is now becoming standard in modern TL dosimetry (Bilski et al, 2008). Its main advantages, which gained them present popularity, are high sensitivity, good tissue equivalence, almost flat energy response, linear dose response and good stability at ambient temperatures, and shorter annealing procedures (Oster et al, 1993;Tang et al, 2007). Since LiF:Mg,Cu,P chips were first developed in Solid Dosimetric Detector and Method Laboratory (DML) (Zha et al, 1986), the main features of LiF:Mg,Cu,P GR-200A have been improved dramatically Tang et al, 1999;Zha et al, 1993).…”

“…Why LiF:Mg,Cu,Si can be heated to higher temperatures is mainly because of a high level of Mg doped in it. A new LiF:Mg,Cu,P formulation doped with much more Mg and Cu than in the standard LiF:Mg,Cu,P dosimeter and a conventional concentration of P (abbreviated as HMCP) was developed at DML (Tang et al, 2007). This new TL material also can be heated to higher temperatures.…”