Preparation and Thermoluminescent Characteristics of Terbium Doped Magnesium Orthosilicate Phosphor

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Abstract
Mg2SiO4(Tb) is the most sensitive thermoluminescent (TL) phosphor studied so far. This paper reports on its preparation and its TL characteristics. Preparation was carried out by direct flame fusion of magnesium oxide, silica gel and terbium peroxide (dopant) mixture. Concentration of dopant for maximum TL sensitivity was found to be 10 mg atom Tb/g mol Mg2SiO4. The TL glow curve of this phosphor shows peaks at 50, 90, 170, 300 and 420°C with a slow linear heating system. About 95% of the total emission appears in the 300°C glow peak. The phosphor is about 80 times more sensitive than LiF. TLD 100. TL emission spectra show that emission centre is Tb3+. It is not sensitive to normal room illumination but strong TL is induced by exposure to 254 nm mercury light.

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