A broad emission band at 430 nm was observed in natural CaCO 3 at 300 K under N 2 laser excitation. The intensity of the emission band decreases gradually under intense excitation. The decreasing curves are analyzed by using simple rate equations. The thermoluminescence (TL) peak at 620 K decreases and TL peaks below 560 K increase after exposure to the laser light. The 430 nm emission is attributed to internal transition of the trap centers which is responsible for the 620 K TL peak. It is suggested that the emission can be used for dating by detecting defects produced by natural radiation.
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Ugumori et al. (1980) studied this question.
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