The 400-nm-thermoluminescence (TL) emission of UV (254.7 nm) irradiated Ca-rich carbonates of inorganic (aragonite) and biogenic (mollusc exoskeleton) origin is here reported. The samples exhibit complex glow curves, but (i) acceptable TL sensitivity when exposed to ultraviolet C (UVC) irradiation and (ii) stability of the UV-induced TL signal with initial rapid decay (ca. 70% for the aragonite and 40% for the biogenic carbonate) while maintaining the stability from 75 and 150 h onwards. The dose response shows a signifi cant scattered behavior up to 8 h of UVC exposure, which may be associated with a combination of the phototransfer TL mechanism, the bleaching process, and the partially ionizing effect of the UVC irradiation.

中文翻译：

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紫外线引起的天然富含Ca的碳酸盐的热致发光

本文报道了紫外线（254.7 nm）辐照的富含Ca的无机（文石）和生物（外骨骼）起源碳酸盐的400 nm热释光（TL）发射。样品表现出复杂的辉光曲线，但（i）暴露于紫外线C（UVC）辐射时可接受的TL敏感性，以及（ii）紫外线诱导的TL信号的稳定性，且初始快速衰减（文石约占70％，文石约占40％ （适用于生物碳酸盐），同时保持75到150小时的稳定性。剂量响应显示出在长达8 h的UVC照射下有明显的分散行为，这可能与光转移TL机理，漂白过程和UVC照射的部分电离效应相结合。