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Abstract

In the present work the sensitization of the entire glow-curve is studied in 6 different quartz samples of Nigerian origin. The investigation was applied to the un-fired “as is” samples as well as to samples fired at 900°C for 1 hour following cooling to room temperature. The results showed that in the case of “as is” glow-curve is sensitized as a whole. There is an abrupt transition from the “natural” sensitivity without any previous heating and the artificial sensitivity induced after the first heating. The sensitization is growing up strongly to the 10th heating but to a lower rate. The sensitization factor of the TL glow-peak at “110°C” was found to be linearly correlated to the higher temperature TL peaks. In the case of annealed samples there is an initial increase between the sensitivity immediately after the end of annealing and after the first heating. As the number of heating is increased up to the 10th heating the sensitization is stabilized at a constant value. The results are discussed in the frame-work of existing models and implications of the sensitization effect in various applications, while some explanations are attempted.

, 1969. Glow curves with general order kinetics. Journal of The Electrochemical Society 116: 1254-1257, DOI 10.1149/1.2412291. Kitis G, Pagonis V, Chen R and Polymeris GS, 2006. A comprehensive comparative study of the pre-dose effect for three quartz crystals of different origins. Radiation Protection Dosimetry 119: 438-441, DOI 10.1093/rpd/nci548. Koul DK and Chougaonkar MP, 2007. Pre-dose phenomenon in the OSL signal of quartz. Radiation Measurements 42: 1265-1272, DOI 10.1016/j.radmeas.2007.04.001. Koul DK, Adamiec G and Chougaonkar MP, 2009. Participation of

the laboratory saturation signal L sat and its corresponding test dose response T sat . The ratios of the “L n ” to L sat and “L n /T n ” to L sat /T sat are shown as a function of first stimulation temperatures in Fig. 7 , for two sizes of test dose, 53 Gy ( Fig. 7a , 7c ) and 595 Gy ( Fig. 7b , 7d ) . These data are similar to those from a dose recovery test except that we are considering the reproducibility of light levels (luminescence intensities) rather than doses. Effect of first stimulation temperature on the degree of saturation. Test doses in (a) and