Five dating protocols with post-infrared infrared (IR) stimulated luminescence signals (i.e. pIRIR) were performed on the K-feldspar of loess samples. Two of them were the single-aliquot regenerative-dose protocol (SAR) with two-step pIRIR stimulation, with the first IR stimulation at 50°C or 200°C and the second at 290°C (pIR₅₀IR₂₉₀, pIR₂₀₀IR₂₉₀). Two of them were the SAR protocols with five-step or six-step IR stimulation at multiple elevated temperatures to 250°C or 300°C (MET-pIRIR₂₅₀, MET-pIRIR₃₀₀). The final one was the multiple-aliquot regenerative-dose (MAR) protocol with the MET-pIRIR₃₀₀ signal, together with a 500°C heat treatment administered before the test dose (‘MAR with heat’). The results show that when the equivalent dose (D_e) of the sample was less than 500 Gy, all of the protocols gave consistent results; however, when D_e exceeded 750 Gy, all of the SAR protocols underestimated D_e. The pIR₅₀IR₂₉₀ signal had the highest degree of underestimation, while the pIR₂₀₀IR₂₉₀, MET-pIRIR₂₅₀ and MET-pIRIR₃₀₀ signals had similar D_e values and similar degrees of underestimation. Possible reasons for the SAR D_e underestimation are discussed. We suggest that only the ‘MAR with heat’ protocol is suitable for samples with D_e exceeding 750 Gy.

中文翻译：

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用钾长石的各种IR后IRSL测年方案获得的等效剂量的比较

在黄土样品的钾长石上用红外光谱（IR）激发的发光信号（即pIRIR）进行了五次测年。其中两个是具有两步pIRIR刺激的单等分再生剂量方案（SAR），第一个IR刺激在50°C或200°C，第二个IR刺激在290°C（pIR ₅₀ IR ₂₉₀，pIR ₂₀₀ IR ₂₉₀）。其中两个是SAR协议，在多个升高到250°C或300°C的温度下（MET-pIRIR ₂₅₀，MET-pIRIR ₃₀₀）具有五步或六步IR刺激。最后一个是采用MET-pIRIR ₃₀₀的多等分再生剂量（MAR）方案信号，以及在测试剂量之前进行的500°C热处理（“ MAR加热”）。结果表明，当样品的当量剂量（D _e）小于500 Gy时，所有方案均给出了一致的结果。但是，当D _e超过750 Gy时，所有SAR协议都会低估D _e。pIR ₅₀ IR ₂₉₀信号被低估的程度最高，而pIR ₂₀₀ IR ₂₉₀，MET-pIRIR ₂₅₀和MET-pIRIR ₃₀₀信号具有相似的D _e值和相似的低估程度。特区的可能原因讨论了D _e低估。我们建议仅“ MAR带热量”方案适用于D _e超过750 Gy的样品。