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Radiation Protection Dosimetry Advance Access originally published online on September 12, 2006
Radiation Protection Dosimetry 2007 125(1-4):229-232; doi:10.1093/rpd/ncl122
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Development of LiF:Mg,Cu,Si TL material (new KLT-300) with a low-residual signal and high-thermal stability

J. I. Lee1,*, J. L. Kim1, M. S. Rahman2, S. Y. Chang1, K. S. Chung3 and H. S. Choe3

1 Health Physics Department, Korea Atomic Energy Research Institute P.O. Box 105, Yuseong, Daejeon, Korea
2 Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology Daejeon 305-701, Korea
3 The Research Institute of Natural Science and Department of Physics, Department of Physics Education Gyeongsang National University, Jinju 660-701, Korea

*Corresponding author: jilee{at}kaeri.re.kr

LiF-based thermoluminescence (TL) materials have been widely used for radiation dosimetry due to their attractive features. LiF:Mg,Cu,P is one of the most sensitive tissue-equivalent TL materials, ~40 times more sensitive than LiF:Mg,Ti (TLD-100), but it has two main drawbacks: a thermal loss of the TL sensitivity when annealed at temperatures >240°C, and a relatively high-residual signal. Recently, LiF:Mg,Cu,Na,Si TL material was developed to overcome these drawbacks at the Korea Atomic Energy Research Institute, but it provided only marginal improvements in reducing the residual signal. The newly developed LiF:Mg,Cu,Si TL material has a significantly lower residual signal and a better stability to thermal treatments. In this article, the preparation method and some dosimetric properties (sensitivity and residual signal) of the new LiF:Mg,Cu,Si TL material are presented. At the end of the preparation procedures, a dual-step annealing method is introduced and this has proved as a very efficient method to reduce the high-temperature peak and is the cause of residual signal. Therefore, the high-temperature peak in the glow curve was significantly reduced. The sensitivity is ~20 times higher than that of TLD-100 and the residual signal was estimated to be ~0.04%.


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