To avoid fading, the readout time of the old LiMgPO4:Er in the previous study had to be taken to be at least 20 s. The readout time is up to 20 s, which not only contradicts the fast OSL readout, but also eliminates too many OSL signals per readout and is not favourable to the requirement that the OSL can be read multiple times. The primary objective of this study is to reduce readout time under conditions where the OSL signal of LiMgPO4:Er phosphor stabilizes after irradiation. The OSL properties were investigated. To achieve OSL fading of about 5% within 30 d after irradiation, the shortest integration time for new LiMgPO4:Er in this study was 1 s, whereas old LiMgPO4:Er required 20 s. When the integration time was 1 s, the OSL sensitivity of the new LiMgPO4:Er samples in this study was about 2.4 times that of the old LiMgPO4:Er samples. A new LiMgPO4:Er phosphor with an OSL signal loss of about 5% for the shortest integration time of 1 s within 30 days after irradiation, a sensitivity comparable to that of TLD-500k, and an MMD as low as 38 μGy was successfully prepared, which will meet the fast read out and the multiple readings requirements.

中文翻译：

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增强光刺激发光灵敏度并改善新开发的 LiMgPO4：Er 荧光粉的衰落


为避免衰落，之前研究中旧 LiMgPO4：Er 的读出时间必须至少为 20 s。读出时间长达 20 s，这不仅与快速 OSL 读出相矛盾，而且每次读出消除了过多的 OSL 信号，不利于可以多次读取 OSL 的要求。本研究的主要目的是在照射后 LiMgPO4：Er 荧光粉的 OSL 信号稳定的情况下减少读出时间。对 OSL 特性进行了调查。为了在照射后 30 d 内实现约 5% 的 OSL 衰落，本研究中新 LiMgPO4：Er 的最短积分时间为 1 s，而旧的 LiMgPO4：Er 需要 20 s。当积分时间为 1 s 时，本研究中新 LiMgPO4：Er 样品的 OSL 灵敏度约为旧 LiMgPO4：Er 样品的 2.4 倍。成功制备了一种新的 LiMgPO4：Er 荧光粉，OSL 信号损失约为 5%，照射后 30 天内最短积分时间为 1 s，灵敏度与 TLD-500k 相当，MMD 低至 38 μGy，将满足快速读出和多次读数的要求。