PROPERTIES OF LIGHT-INDUCED EPR SIGNALS IN ENAMEL AND THEIR POSSIBLE INTERFERENCE WITH GAMMA-INDUCED SIGNALS

Exposure of tooth enamel to natural and artificial UV light results in stable EPR signals with g-factors of 1.9985, 2.0018, 2.0045, 2.0052 a nd 2.0110. The first three signals correspond to the parallel and perp endicular components of the radiation induced or dosimetric signal and the native signal reported in dosimetry and dating studies. The latte r two signals were found to be sensitive to both gamma-ray and sunligh t exposure, however, their responses to light differed from that to ra diation, giving rise to the possibility of using them as indicators of the dose-equivalent resulting from light exposure. (C) 1998 Elsevier Science Ltd. All rights reserved.