Abstract Three quartz samples extracted from different origins were collected for ESR evaluation to appreciate the optical bleaching characteristics of the E1’ centre in a long time scale. After exposure of about 400 hours to artificial sunlight, the E1’ centre were bleached to a steady increasing level, about 2.5 times of its natural level, and the increase level also exhibit a small variability among different sample origins. The constant increasing level provide a significantly evidence for the potential use of the natural signal intensities of quartz E1’ centre in tracing sediment provenance. The results show that the signal intensity of E1’ centre increased within beginning 84 h and decreased after 202 h as previous researches have partly predicted. After long time exposed to sunlight, there is no correlation between irradiated samples’ dose rate and its E1’ centre ESR signal intensity. Thus, no new convenient indication shed light on the possible use of the E1’ centre for ESR sediment dating.

中文翻译：

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E1'中心长时间人工光学漂白在沉积物ESR测年中的应用

摘要 采集了三个不同产地的石英样品进行ESR评价，以了解E1'中心长时间尺度的光学漂白特性。在人工日光照射约 400 小时后，E1' 中心被漂白到稳定增加的水平，约为其自然水平的 2.5 倍，并且增加的水平在不同样品来源之间也表现出很小的差异。不断增加的水平为石英 E1' 中心的自然信号强度在追踪沉积物来源中的潜在用途提供了重要证据。结果表明，E1' 中心的信号强度在开始 84 小时内增加，并在 202 小时后下降，正如先前研究部分预测的那样。长时间暴露在阳光下，辐照样品的剂量率与其 E1' 中心 ESR 信号强度之间没有相关性。因此，没有新的方便的迹象表明 E1' 中心可能用于 ESR 沉积物测年。