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STUDY OF STABILIZING CaF2:Dy ULTRAVIOLET SENSITIVITY BY DOUBLE ANNEALING TREATMENT

Li, Shih-Hai*; Hsu, Pin-Chieh; Liao, Chia-Chun*; Weng, Pao-Shan

Health Physics: The Radiation Safety Journal: May 2000 - Volume 78 - Issue 5 - p 507-510
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Abstract— The intrinsic thermoluminescent response to ultraviolet radiation of CaF2:Dy phosphor is enhanced by pre-irradiation high-temperature annealing treatment. The thermoluminescent response is stabilized by adding a medium temperature annealing treatment after the previous annealing. The experimental results show that the annealing treatment of 1 h 850°C high-temperature annealing followed by 1 h 350°C medium-temperature annealing is the optimum treatment to have high thermoluminescent response and good stability. The results also show that (1) the thermoluminescent response to 253.7 nm ultraviolet radiation is increased and stabilized, (2) the thermoluminescent sensitivity and glow curve distribution to 235.7 nm ultraviolet radiation are retained, and (3) the thermoluminescent response to 253.7 nm ultraviolet is linear from 3 to 1 × 103 Jm−2, but there is no linear response with respect to 365 nm ultraviolet.

*Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan, 300 R.O.C.;

†Nuclear Science and Technology Development Center, National Tsing Hua University, Hsinchu, Taiwan, 300 R.O.C.;

‡Department of Nuclear Science, National Tsing Hua University, Hsinchu, Taiwan, 300 R.O.C.

Manuscript received 27 November 1998;

revised manuscript received 9 November 1999, accepted 30 December 1999

For correspondence or reprints contact: Shih-Hai Li, Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan, 300 R.O.C.

©2000Health Physics Society