Concerning secondary thermoluminescence peaks in α-Al_2_O_3_:C

Chithambo, M.L. (2004) Concerning secondary thermoluminescence peaks in α-Al_2_O_3_:C. South African Journal of Science, 100 (11&12). pp. 524-527. ISSN 0038-2353

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Abstract

Thermoluminescence characteristics of two subsidiary glow peaks, one below 100°C and the other above 300°C, have been studied for measurements between 30°C and 500°C in α-Al_2_O_3_:C. The thermoluminescence intensity of the lower temperature peak decreased with storage with a half-life of about 150 s. In contrast, the intensity of the higher temperature peak increased with storage towards some maximum. The peak-temperature of each of the secondary glow peaks was essentially constant with dose, whereas that of the main peak decreased with irradiation. The dose response for the three peaks was similar except for sublinear growth in the higher temperature peak at low dose values. These effects are discussed in terms of changes in the concentration of F+ luminescence precursors brought about by competitive electron retrapping at deep electron-traps or hole-traps. This work refines the physics and application of α-Al_2_O_3_:C luminescence in radiation dosimetry.

Item Type:Article
Additional Information:Rhodes Centenary issue
Uncontrolled Keywords:thermoluminescence, radiation dosimetry
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Physics & Electronics
ID Code:95
Deposited By: Rhodes Library Archive Administrator
Deposited On:25 Aug 2005
Last Modified:06 Jan 2012 16:17
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