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| ウラン・トリウム年代測定法× | 電子スピン共鳴年代測定法× | |
|---|---|---|
| 分野 | 考古学 | 考古学 |
| 系統 | Process / pipeline | Process / pipeline |
| 提唱年≠ | 1955 | 1980s |
| 提唱者≠ | Harmon Craig | Michael Aitken |
| 種類≠ | Decay series dating technique | Paramagnetic resonance dating technique |
| 原典≠ | Edwards, R. L., Chen, J. H., & Wasserburg, G. J. (1987). U-238, U-234 and Th-230 in seawater. Geochimica et Cosmochimica Acta, 51(5), 1213-1225. link ↗ | Grün, R. (1989). Electron spin resonance (ESR) dating. Quaternary International, 1, 65-109. DOI ↗ |
| 別名≠ | U-Th dating, thorium-230 dating | ESR dating, electron paramagnetic resonance dating, EPR dating |
| 関連 | 4 | 4 |
| 概要≠ | Uranium-thorium (U-Th) dating is a chronometric method that determines the age of carbonates, shells, bones, and coral by measuring the ratio of uranium isotopes to thorium-230. First applied by Harmon Craig in the 1950s, it exploits the natural radioactive decay chain of uranium. U-Th dating is particularly valuable for dating materials from 500 to 500,000 years old, filling a crucial chronological gap between radiocarbon and potassium-argon dating. | Electron spin resonance (ESR) dating is a chronometric method that determines the age of bones, teeth, mollusk shells, and sediments by measuring accumulated radiation-induced unpaired electrons. Developed by Michael Aitken in the 1980s, ESR detects free radicals trapped in mineral crystal structures. Unlike luminescence techniques that require heating or light exposure, ESR directly measures paramagnetic defects, making it particularly valuable for dating dental and skeletal remains that are inaccessible to other methods. |
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