Development of LiF:Mg,Cu,Si TL material (new KLT-300) with a low-residual signal and high-thermal stability.
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, approximately 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 degrees 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 approximately 20 times higher than that of TLD-100 and the residual signal was estimated to be approximately 0.04%.
Lee
J I
JI
Health Physics Department, Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon, Korea. jilee@kaeri.re.kr
Kim
J L
JL
Rahman
M S
MS
Chang
S Y
SY
Chung
K S
KS
Choe
H S
HS
D004307:Dose-Response Relationship, Radiation; D004781:Environmental Exposure / Q000032:analysis*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005459:Fluorides / Q000737:chemistry* / Q000528:radiation effects*; D038622:Internationality; D018020:Lithium Compounds / Q000737:chemistry* / Q000528:radiation effects*; D008422:Materials Testing; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000295:instrumentation*; D011835:Radiation Protection / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013696:Temperature
D018020:Lithium Compounds; C027651:lithium fluoride; D005459:Fluorides