まとめ
研究者らは,磨かれた石の断片を用いた新しい熱発光年代測定法を開発し,チートとカルセドニーの火化年代測定の精度を高めて,紀元前30万年までの年代測定を行いました.
科学分野:
- アーケオメトリー考古学
- ジオクロノロジー (Geochronology) について
- ルミネッサンス デート
背景:
- 熱発光 (Thermoluminescence,TL) 年代測定は,火石のような燃焼した材料の年代測定は,考古学と地質学の研究において極めて重要です.
- 粉状のサンプルを使用する従来の方法は,トリボテルモルミネスセンスの干渉と再生熱ミネスセンスの干渉に苦しんでおり,精度を制限しています.
研究 の 目的:
- 焼いた石の熱発光年代測定技術を精製する.
- より正確な年齢決定のために,干渉する光信号を排除するために.
- チェルトとカルセドニー断片の年代測定のための信頼できる方法を確立する.
主な方法:
- 熱発光測定のための粉末の代わりに,焼いた石の薄く磨かれた切片を使用します.
- 内部と外部の放射線用量の速度を測定する.
- この方法をスペインのカリゲーラから採取した考古学的サンプルに適用した.
主要な成果:
- トリボ熱発光と再生熱発光による干渉の除去.
- チェルトとカルセドニウム断片のピロ化による正確な絶対年代測定 (10~15%の精度).
- 考古学的なサンプルの年代付けは,紀元前1万2000年から5万年までのものです. (旧石器時代後期からモウステリアン時代まで) と,銅器時代の標本で,紀元前4,300年.
結論:
- 磨かれたスライス法により,焼いた石の熱発光年代測定の信頼性が著しく向上します.
- この技術により,紀元前30万年までの物質に関する正確な地質年代測定データが得られます.
- この方法は,考古学的サンプルに関する他の年代測定技術と一貫した結果によって検証されています.
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