Light Induced Fading in Alpha-Al2O3:C

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Abstract
Experiments were conducted to determine the loss of TL information when a-Al2O3:C, previously exposed to ionising radiation, is subsequently exposed to visible light. It has been shown that fluorescent as well as incandescent light induces fading in a-Al2O3:C. The loss of TL signal following 10 min. of exposure to 300-450 lx of fluorescent and incandescent light was found to be 83% and 33% respectively. Using yellow light reduces this figure to 16%. However, for long exposure times up to three hours, 95% of the TL signal fades irrespective of the type of light sources used. The high sensitivity of a-Al2O3:C with its relatively lower effective atomic number, makes it an excellent candidate for applications such as personnel and especially environmental dosimetry. However, in both of these applications great care should be used to eliminate any possible exposure of this material to light.

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