日本地球惑星科学連合2022年大会

講演情報

[E] ポスター発表

セッション記号 S (固体地球科学) » S-CG 固体地球科学複合領域・一般

[S-CG42] 地殻表層の変動・発達と地球年代学/熱年代学の応用

2022年6月1日(水) 11:00 〜 13:00 オンラインポスターZoom会場 (26) (Ch.26)

コンビーナ:長谷部 徳子(金沢大学環日本海域環境研究センター)、コンビーナ:末岡 茂(日本原子力研究開発機構)、田上 高広(京都大学大学院理学研究科)、コンビーナ:Lee Yuan Hsi(National Chung Cheng University)、座長:末岡 茂(日本原子力研究開発機構)、長谷部 徳子(金沢大学環日本海域環境研究センター)、福田 将眞(日本原子力研究開発機構)、Hsin-Yu Lee(Department of Geoscience, National Taiwan University)

11:00 〜 13:00

[SCG42-P08] A Study of IRSL Dating with the Kanazawa University Instrument

*渋谷 侑磨1長谷部 徳子1 (1.金沢大学)

キーワード:IRSL年代測定法、長石

Optically Stimulated Luminescence (OSL) dating is widely used to date the time elapsed since mineral grains' last exposure to the light, or age of sedimentation (Zhang. et al. 2020). Quartz, in particular, has been widely used in dating due to its simple crystal structure and stable OSL signal. However, age range by quartz OSL is restricted (e.g., Pietsch et al., 2008, Sawakuchi et al., 2018).
Therefore, feldspar dating has been attracting attention. This method is commonly referred to as IRSL dating because it uses infrared light as the excitation light. The use of feldspar has been limited in the past due to a phenomenon called fading, in which the signal that was once stored in the feldspar disappears without any action. However, a number of measurements protocols have now emerged to solve the fading problem (Huntley and Lamothe, 2001, Thomsen et al., 2008, etc.).
The luminescence reader installed in Kanazawa University starts to measure IRSL when an aliquot is moved on the heating element, which is a slightly different procedure from that of the Riso TL/OSL Reader system commonly used worldwide. In this study, we examined measurement protocols to reliably estimate accumulated dose by IRSL obtained by the domestic luminescence reader..