古代瓷器、陶器、砖瓦和范土等文物的烧成温度区间不同,不同烧成温度的文物会对释光测年方法的适用性产生影响。本研究选择4种不同烧成温度的文物——上海青龙镇遗址出土的1件青釉瓷片、上海广富林遗址出土的1件陶片、山东龙山汉墓群出...古代瓷器、陶器、砖瓦和范土等文物的烧成温度区间不同,不同烧成温度的文物会对释光测年方法的适用性产生影响。本研究选择4种不同烧成温度的文物——上海青龙镇遗址出土的1件青釉瓷片、上海广富林遗址出土的1件陶片、山东龙山汉墓群出土的1件釉砖,以及三星堆出土的3件范土样品,使用多种释光测年方法进行测年。结果表明,对于陶瓷类文物的释光测年,可通过使用多种方法相互验证来提高测年结果准确度。基于最小损坏的取样原则,因少量样品无法有效地分离不同矿物,本研究对于每件陶瓷类文物样品采取混合矿物颗粒进行测年。结果表明:对于烧成温度较低(低于450℃)或烧成温度较高但烧成时间很短时的样品(如本研究中的范土样品,由于烧成温度太低,存在无法清空常规热释光法和前剂量法信号的问题,因此无法使用热释光法对范土样品准确定年),可使用钾长石pIR 50 IR 170信号单片再生(single-aliquot regenerative-dose,SAR)法进行测年;对于烧成温度介于约450~1150℃之间的样品(如本研究中的陶器和砖瓦样品),可针对其中的钾长石矿物使用常规热释光法和pIR 50 IR 170信号SAR法进行测年,而针对其中的石英矿物颗粒使用前剂量法测年——需注意的是前剂量法只适用于年代≤1500年的文物;对于烧成温度≥1150℃的样品(如本研究中的瓷器样品,由于其中的钾长石晶体大部分熔融成玻璃相无法使用常规热释光法和IRSL信号法测年),可针对样品内的石英矿物颗粒使用前剂量法和OSL信号SAR法测年。本研究初步证明光释光信号具有测定低温烧制文物年龄的潜力,具有更广泛的烧制温度适用范围。展开更多
At about 173 ka BP of the late period of mid-Pleistocene, the second terrace of the river had been formed as a result of uplift happening in Shangshan area because of the climate, sea level change and tectonic action....At about 173 ka BP of the late period of mid-Pleistocene, the second terrace of the river had been formed as a result of uplift happening in Shangshan area because of the climate, sea level change and tectonic action. Between 173-75 ka BP, aeolian deposited on the terrace, a layer of reticulate red clayey soil about 80-100 cm thick deposited and developed under the warmer and higher temperature. In the last glacial period, the drop of the temperature and the decrease of the precipitation induced the dust-storms increased, A layer of Xiashu loess about 1.0-1.5 m thick accumulated on Shangshan terrace in the last glacial, which has the reticulate red clayey soil buried. At the beginning of the Holocene （11500 a BP-）, temperature went higher gradually and precipitation got more, the pre-persons moved on the Shangshan terrace （11,400-8600 a BP）, which is one of the most important archaeological sites, and can connect the paleolithic culture with Neolithic culture. It could be assumed from the results that the lower reaches of the Yangtze River are the home of rice cultivation, too. The lower place to the west of the Shangshan site experienced the two cycles process of the fluvial facies and the lacustrine facies, indicating that the water source of the pre-historical Shangshan is the river water or lake water. Two AMS 14C age proved the water source disappeared more than 1000 years ago.展开更多
KCaPO4 doped with different concentrations of Sm was synthesised by a high-temperature solid-state method, and the crystal structure, morphology, TL and OSL properties of Sm-doped KCaPO4 were systematically investigat...KCaPO4 doped with different concentrations of Sm was synthesised by a high-temperature solid-state method, and the crystal structure, morphology, TL and OSL properties of Sm-doped KCaPO4 were systematically investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermoluminescence (TL), and optically stimulated luminescence (OSL) techniques. The results show that 0.3 mol% Sm-doped KCaPO4 annealed at 1073 K for 1 h has the highest TL intensity, and thus is expected to be a candidate material for thermoluminescence dosimetry applications.展开更多
文摘古代瓷器、陶器、砖瓦和范土等文物的烧成温度区间不同,不同烧成温度的文物会对释光测年方法的适用性产生影响。本研究选择4种不同烧成温度的文物——上海青龙镇遗址出土的1件青釉瓷片、上海广富林遗址出土的1件陶片、山东龙山汉墓群出土的1件釉砖,以及三星堆出土的3件范土样品,使用多种释光测年方法进行测年。结果表明,对于陶瓷类文物的释光测年,可通过使用多种方法相互验证来提高测年结果准确度。基于最小损坏的取样原则,因少量样品无法有效地分离不同矿物,本研究对于每件陶瓷类文物样品采取混合矿物颗粒进行测年。结果表明:对于烧成温度较低(低于450℃)或烧成温度较高但烧成时间很短时的样品(如本研究中的范土样品,由于烧成温度太低,存在无法清空常规热释光法和前剂量法信号的问题,因此无法使用热释光法对范土样品准确定年),可使用钾长石pIR 50 IR 170信号单片再生(single-aliquot regenerative-dose,SAR)法进行测年;对于烧成温度介于约450~1150℃之间的样品(如本研究中的陶器和砖瓦样品),可针对其中的钾长石矿物使用常规热释光法和pIR 50 IR 170信号SAR法进行测年,而针对其中的石英矿物颗粒使用前剂量法测年——需注意的是前剂量法只适用于年代≤1500年的文物;对于烧成温度≥1150℃的样品(如本研究中的瓷器样品,由于其中的钾长石晶体大部分熔融成玻璃相无法使用常规热释光法和IRSL信号法测年),可针对样品内的石英矿物颗粒使用前剂量法和OSL信号SAR法测年。本研究初步证明光释光信号具有测定低温烧制文物年龄的潜力,具有更广泛的烧制温度适用范围。
基金National Science and Technology Support Program, No.2006BAK21B02 National Basic Research Program of China, No.2003CB415201 National Natural Science Foundation of China, No.40671016
文摘At about 173 ka BP of the late period of mid-Pleistocene, the second terrace of the river had been formed as a result of uplift happening in Shangshan area because of the climate, sea level change and tectonic action. Between 173-75 ka BP, aeolian deposited on the terrace, a layer of reticulate red clayey soil about 80-100 cm thick deposited and developed under the warmer and higher temperature. In the last glacial period, the drop of the temperature and the decrease of the precipitation induced the dust-storms increased, A layer of Xiashu loess about 1.0-1.5 m thick accumulated on Shangshan terrace in the last glacial, which has the reticulate red clayey soil buried. At the beginning of the Holocene （11500 a BP-）, temperature went higher gradually and precipitation got more, the pre-persons moved on the Shangshan terrace （11,400-8600 a BP）, which is one of the most important archaeological sites, and can connect the paleolithic culture with Neolithic culture. It could be assumed from the results that the lower reaches of the Yangtze River are the home of rice cultivation, too. The lower place to the west of the Shangshan site experienced the two cycles process of the fluvial facies and the lacustrine facies, indicating that the water source of the pre-historical Shangshan is the river water or lake water. Two AMS 14C age proved the water source disappeared more than 1000 years ago.
文摘KCaPO4 doped with different concentrations of Sm was synthesised by a high-temperature solid-state method, and the crystal structure, morphology, TL and OSL properties of Sm-doped KCaPO4 were systematically investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermoluminescence (TL), and optically stimulated luminescence (OSL) techniques. The results show that 0.3 mol% Sm-doped KCaPO4 annealed at 1073 K for 1 h has the highest TL intensity, and thus is expected to be a candidate material for thermoluminescence dosimetry applications.
