We investigate the electrical conductivity of a TiO 2 surface layer on insulators induced by radiation exposure. The surface layer is sufficiently thin to transmit radiation (typically γ-rays) without absorption, but exhibits a current signal indicating the interaction processes of the radiation with substrate insulators. We explain this effect arising from the layered structure and demonstrate a Monte Carlo simulation of photons and electrons to show that electrons generated by irradiation in the substrate travel and cause energy deposition onto the thin layer, envisaging a new type of radiation detector.
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Date et al. (2007) studied this question.
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