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

Abstract

The dosimetric properties of the newly developed thermoluminescence (TL) material (LiF:Mg,Cu,Si) at Korea Atomic Energy Research Institute (KAERI) were investigated. The energy response of the detector was performed for photon energies from 20 to 662 keV. The dose response for this TL material (LiF:Mg,Cu,Si) was linear up to 10 Gy and a sublinear response was observed for higher doses. The reusability of this newly developed TL detector sufficiently satisfied IEC standards. Detection threshold of LiF:Mg,Cu,Si TL material was investigated and found to be 930 nGy by Harshaw 4500 TLD reader.

Thermoluminescent Phosphors for Radiation Dosimetry

“…The minimum measurable dose value of 0.3 µGy as 3σ of the background readout of unirradiated samples was reported [25]. The reusability of this newly developed TL detector sufficiently satisfied IEC standards [80]. It is also reported [81] that indigenously developed 6 LiF:Mg,Cu,Si and 7 LiF:Mg,Cu,Si TLDs provided a better alternative to TLD-600 and TLD-700 for the dosimetry of mixed fields of neutrons and gamma rays.…”

“…Therefore, the authors strongly believed that LiF:Mg,Cu,P could be replaced by LiF:Mg,Cu,Si in the field of radiation dosimetry. Lee et al [77] and Kim et al [80] reported that for the reader annealing using a maximum readout temperature and clamping at 260 0 C, no significant change in the TL sensitivity and glow curve structure was observed for more than 100 reuse cycles of exposures (5.5 mGy) and readout. However, requirement of dual-step annealing method, for restoration of sensitivities of peaks 1-4, is indicative of complex nature of defects in this triplydoped phosphor.…”

“…et al[60,61], Wu et al[62], DeWerd et al[95], Bhatt et al[27,96], Wang et al[63,64], Driscoll et al[ 52], Prokic and Botter-Jensen[23], Zha et al[24], Pradhan and Bhatt[97], Mahajna et al[85], Bilski et al[87,89], etc.. LiF:Mg,Cu,Na,Si and LiF:Mg,Cu,Si TL phosphors have been characterised by Nam et al[72], Jung et al[73], Lee et al[74], Tang et al[75,76], Lee et al[78,79], Kim et al[25], Rahman et al[80] and Tang et al[82,83].…”