A negative relationship has been reported for the characteristic saturation dose (D) of the quartz optically stimulated luminescence (OSL) signal and the quartz grain size, of which the mechanism is still not understood. Here, the natural coarse-grained quartz samples (63–90 μm, 90–125 μm) are artificially ground into fine grains and the effect of alpha irradiation on the D values of the ground fine grains is investigated. The ground fine grains (4–11, 11–45, 45–63 μm) have similar D values as the coarse grains. Laboratory alpha irradiation is administered on the artificial 4–11 μm quartz fraction. The D shows an increasing trend with the amount of alpha irradiation; meanwhile, the proportion of the fast OSL component decreases and the proportions of the medium and slow components increase with alpha irradiation. The higher D after alpha irradiation may be a result of the higher proportion of electron traps related to the medium component. However, the increasing trend of D stops when the alpha dose reaches a certain amount, and the degree of D increase induced by alpha irradiation cannot fully account for the much higher D values of the fine quartz grains in nature.

中文翻译：

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α辐射对细粒石英OSL饱和特性的影响

据报道，石英光激发光（OSL）信号的特征饱和剂量（D）与石英晶粒尺寸呈负相关，但其机制仍不清楚。在这里，将天然粗粒石英样品（63-90 μm、90-125 μm）人工研磨成细粒，并研究 α 辐射对研磨细粒 D 值的影响。研磨后的细颗粒（4-11、11-45、45-63 μm）与粗颗粒具有相似的 D 值。实验室 α 辐射对人造 4-11 μm 石英碎片进行。 D随α照射量的增加呈增加趋势；同时，随着α辐照，快OSL成分的比例减少，中、慢成分的比例增加。 α 辐射后较高的 D 可能是与介质成分相关的电子陷阱比例较高的结果。然而，当α剂量达到一定量时，D的增加趋势停止，并且α辐照引起的D增加程度不能完全解释自然界中细石英颗粒的更高的D值。