Establishment of OSL-thermometer and Estimation of firing temperature of archeological remains and artifacts

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K00974
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 03050:Archaeology-related
• Research Institution: Rissho University
• Principal Investigator: Shitaoka Yorinao 立正大学, 地球環境科学部, 准教授 (10418783)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: OSL感度変化法 / 被熱温度推定 / X線回折分析 / 長石 / 焼成考古遺物 / 縄文土器 / 焼石

Outline of Final Research Achievements

Firing temperature estimation by the optically stimulated luminescence (OSL) method can be performed even when the sample is exposed to light, and the sample can be processed in bright locations. Therefore, the number of analyses for firing temperature estimation is expected to increase dramatically. Here, basic experiments on isochronous annealing and isothermal annealing for estimating the heat capacity by the OSL method were conducted to confirm the validity as the method. Comparison with the results of X-ray diffraction analysis was also conducted to confirm the accuracy of the estimated heat-sensitive temperature based on the presence or absence of clay minerals. Furthermore, we estimated the heat-sensitive temperature of Jomon pottery and were able to consider that the firing temperature did not change with time and that there is a possibility that the heat-sensitive temperature varies depending on the part of the pottery.

Free Research Field

考古理学（年代測定）

Academic Significance and Societal Importance of the Research Achievements

OSL法で推定される焼石や焼土の被熱温度を、Ｘ線回折分析を用いて得られたデータと相互比較を行う。そして、OSL「温度計」の正確度を検証する。そうすることで、極少量の試料での測定を可能にし、焼成考古試料に対する被熱温度情報の解像度を高めることで、「OSL度計」を用いた温度情報データで先史時代から歴史時代における加熱処理行為をもちいた生業活動研究解明に寄与することができる。