用改进的单片再生剂量法测定多矿物细粒黄土的等效剂量

Equivalent Dose Estimation of Polymineral Fine Grains Using Improved Single-aliquot Regenerative-dose Protocol

应用单片再生剂量法对陕西关中的全新世黄土进行细颗粒蓝光释光、红外释光和红外之后的蓝光释光的等效剂量De测定,在实验中用一固定的实验剂量(Dt≈(10%～20%)De)的释光信号来校正灵敏度的变化。在这3种释光信号中,红外之后的蓝光释光信号较为稳定,其De值较接近预测值。说明预先红外暴露去除了低能量的陷阱电子,剩下了稳定的高能量陷阱电子。

A new signle0aliquot regenerative-dose protocol is used to estiamte the equivalent dose (De) in polymineral fine grains extracted from Holocene loss in Guanzhong, Shaanxi, in which three signals, blue-stimulated, post-IR blue stimulated and IR stimulated luminescence, are measured. In this approach, each natural or regenerated dose OSL is corrected for changes in sensitivity using the OSL response to a constant test dose (10%-20% of De). Among these three luminescence signals, post-IR blue simulated luminescence provides reliable estimates of De. It is concluded that prior-IR exposure may dispel the trapped electrons with lower energy, and post-IR blue simulated luminescence is mainly generated by the trapped electrons with higher energy.