TAILIEUCHUNG - Báo cáo "Dependence of glow curve structure on the concentration of dopants in LiF:Mg,Cu,Na,Si thermoluminescent material "

Lithium fluoride (LiF) thermoluminescent powder doped with Mg, Cu, Na, and Si as activators was prepared. The dopant concentrations were varied over the wide ranges as follows: Mg ( - mol$\%$), Cu ( - mol$\%$), Na,Si ( - mol$\%$). The results indicated that the Mg and Cu activators are crucial dopants in the LiF:Mg,Cu,Na,Si phosphors. The LiF:Cu,Na,Si samples without Mg exhibit a peak at low temperature in the thermoluminescent glow curve and in the absence of Cu, the LiF:Mg,Na,Si samples exhibit a peak at high temperature. The Na,Si were effective dopants in producing the high intensity of. | VNU Journal of Science Mathematics - Physics 25 2009 83-90 Dependence of glow curve structure on the concentration of dopants in LiF Mg Cu Na Si thermoluminescent material Vu Thi Thai Ha1 Nguyen Thi Quy Hai1 Nguyen Ngoc Long2 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 31 July 2009 received in revised form 30 August 2009 Abstract. Lithium fluoride LiF thermoluminescent powder doped with Mg Cu Na and Si as activators was prepared. The dopant concentrations were varied over the wide ranges as follows Mg - mol Cu - mol Na Si - mol . The results indicated that the Mg and Cu activators are crucial dopants in the LiF Mg Cu Na Si phosphors. The LiF Cu Na Si samples without Mg exhibit a peak at low temperature in the thermoluminescent glow curve and in the absence of Cu the LiF Mg Na Si samples exhibit a peak at high temperature. The Na Si were effective dopants in producing the high intensity of the low-temperature peaks and the main peak. The emission spectrum measurements at each peak temperature of the TL glow curve were carried out for the LiF Mg Cu Na Si sample. The results showed that with increasing the peak temperature of the TL glow curve the peak wavelength is generally shifted towards the low wavelength side. 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 . 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 .

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