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The high temperature measurements are limited by the black body radiation, otherwise probably much higher temperature peaks would have been seen up to the melting point of the material in hand. b. Experimental. In order to perform a thermoluminescence (TL) measurement on a given sample, the experimental arrangement should permit the excitation of the specimen by the appropriate irradiation, its heating in accordance with a pre­ determined heating programme and its fast cooling. We also need an accurate measurement and recording of the specimen temperature and of the emitted light as a function of the measured temperature.

Several workers dealt with the re­ solving of neighbouring TL peaks, the earliest seems to be the work by Williams and Eyring (1946) and Williams (1949). 6. As mentioned already, in certain cases the same impurity may serve as a trapping state releasing carriers in one TL peak and as a recombination centre in another (see chapter 9 ) . In these cases, additional experiments are needed in order to get information on the trapping states. This includes more complex thermally stimulated measurements such as thermal and optical bleaching, spectrum of excitation and emission, dose dependence, simultaneous measurements (TL and TSC, for example) and phototransfer, as elaborated in chapter 8 below.

Light source; Temp - Thermocouple; Ti Optical filter to avoid stray light; F 2 - Optical filter for crude emission analysis (can be replaced by a second monochromator). 2K) for basic research purposes. The samples used are single crystals or polycrystallites in some cases and powders in other cases. Apart from the efficiency of heat conduction to various parts of the specimen, this character of the sample (single crystal or powder) is not expected to influence substantially the luminescence results.

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