tailieunhanh - Study of Heating Rate Effect on Thermoluminescence Glow Curves of LiF: Mg, Cu, P
The results showed that as the heating rate increases, the peak intensity at the maximum decreases and shifts to higher temperature. The thermoluminesecnce sensitivity of the material also changes and has the optimal value at 6oC/s. This value is also adaptable for measurement of natural environmental and archaeologicaldose. | VNU Journal of Science: Mathematics – Physics, Vol. 34, No. 1 (2018) 46-51 Study of Heating Rate Effect on Thermoluminescence Glow Curves of LiF: Mg, Cu, P Bui Thi Hong1,*, Vu Anh Hung1,3, Nguyen Quang Mien2, Bui Van Loat1 1 VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam 2 Institute of Archaeology, 61 Phan Chu Trinh, Hanoi, Vietnam 3 Military Technical Academy, 236 Hoang Quoc Viet, Hanoi, Vietnam Received 23 August 2017 Revised 19 October 2017; Accepted 08 January 2018 Abtract: The samples of LiF: Mg,Cu,P powder (xeri: GR-200) were irradiated by the gamma radiation resource with varied exposed dose. The glow curves of thermoluminescence (TL) material were observed with the defferent heating rates. The influence of heating rate on the thermoluminescence property of LiF: Mg,Cu,P was analyzed. The results showed that as the heating rate increases, the peak intensity at the maximum decreases and shifts to higher temperature. The thermoluminesecnce sensitivity of the material also changes and has the optimal value at 6oC/s. This value is also adaptable for measurement of natural environmental and archaeologicaldose. Keywords: Thermoluminescence dosimetry, Environment, Archaeology. 1. Introduction Radiation dosimetric investigations in diagnostic radiology have been increasing in importance in the last two decades. The most widely used method in radioactivity dosimetry is thermoluminescence technique [1]. Several types of thermoluminescent dosimeters (TLD) are commercially available for a wide range of applications: personnal, environmental and medical dosimetry, and archaeological dating, etc. Lithium fluoride doped with magnesium, copper, and phosphorus LiF:Mg,Cu,P has recently emerged as TL material with significant advantages which outperformed many other materials [2]. Due to several important properties, such as tissue equivalence, relative low fading and low fading’s high sensitivity, LiF has mainly been recommended for environmental .
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