TAILIEUCHUNG - Báo cáo " Preparation and characteristics of LiF:Mg,Cu,Na,Si thermoluminescent material "

Lithium fluoride (LiF) thermoluminescent powder doped with Mg, Cu, Na, and Si as activators was prepared. X-ray diffraction analysis indicated that doping LiF with different activators makes crystal lattice somewhat expand. The dosimetric properties of the powder were studied. The main dosimetric peak of LiF:Mg,Cu,Na,Si appeared in the range of 227−247o C and the ratio of the height of the main peak to that of the other small peaks in the LiF:Mg,Cu,Na,Si is much greater than that in the LiF:Mg,Ti and LiF:Mg,Cu,P. . | VNU Journal of Science Mathematics - Physics 23 2007 225-231 Preparation and characteristics of LiF Mg Cu Na Si thermoluminescent material Vu Thi Thai Ha1 Nguyen Thi Quy Hai1 Nguyen Ngoc Long2 Le Van Vu2 1 Institute of Materials Science VAST 18 Hoang Quoc Viet Cau Giay Hanoi Vietnam 2 Center for Materials Science College of Science VNU 334 Nguyen Trai Thanh Xuan Hanoi Vietnam Received 28 November 2007 Abstract. Lithium fluoride LiF thermoluminescent powder doped with Mg Cu Na and Si as activators was prepared. X-ray diffraction analysis indicated that doping LiF with different activators makes crystal lattice somewhat expand. The dosimetric properties of the powder were studied. The main dosimetric peak of LiF Mg Cu Na Si appeared in the range of 227-247 C and the ratio of the height of the main peak to that of the other small peaks in the LiF Mg Cu Na Si is much greater than that in the LiF Mg Ti and LiF Mg Cu P. The preparation conditions such as annealing temperature and duration annealing atmosphere doping with different activators etc. were investigated. 1. Introduction LiF-based thermoluminescent TL materials are widely used as a personal dosimetric material because of their low energy dependence high sensitivity stability and tissue equivalency. The thermoluminescent dosimetry TLD material based on LiF that has been studied most extensively is LiF Mg Ti which is widely used in personal dosimetry and available in the market under trade names like TLD-100 and its variations TLD-600 and TLD-700 1 . Although LiF Mg Ti has proven to be a useful material for TLD many researches for developing the more advanced TL materials have been accomplished. Nakajima et al. 2 were the first to describe the properties of LiF doped with Mg Cu and P impurities. This TL material combines two attractive properties namely a high sensitivity and a good tissue equivalency. This LiF Mg Cu P material has been improved and commercialized by Chinese GR-200 Japanese NTL-500 Polish MCP-N .

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