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第四紀沉積定年概論 Luminescence Dating

第四紀沉積定年概論 Luminescence Dating. 陳于高老師 陳雅雯. 螢光發光原理. 電子陷阱之參數數值. a The peak temperatures are for the heating rates used in the work concerned, usually 2-10 o C/sec. b IR, initial rise; ID, isothermal decay; PS, peak shift with heating rate; CF, curve fitting. (Aitken, 1985).

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第四紀沉積定年概論 Luminescence Dating

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  1. 第四紀沉積定年概論Luminescence Dating 陳于高老師 陳雅雯

  2. 螢光發光原理

  3. 電子陷阱之參數數值 a The peak temperatures are for the heating rates used in the work concerned, usually 2-10oC/sec. b IR, initial rise; ID, isothermal decay; PS, peak shift with heating rate; CF, curve fitting. (Aitken, 1985)

  4. Equivalent dose Annual dose Natural intensity Age = = Annual intensity 螢光定年

  5. 標本的前處理

  6. 螢光定年法 Age = Annual dose

  7. 年劑量的計算(Annual dose) • 直接法: • 於現場放置劑量子(TLD) • 間接法: • ICPMS(U.Th)+XRF(K) • Gamma Spectrometry • (U.Th.K) • 宇宙射線: • 校正因緯度、深度、高度的不同而造成的差異。

  8. 螢光定年法 Equivalent dose Age = Annual dose

  9. 熱螢光強度 (TL Intensity) 光螢光強度 (OSL Intensity) N+b2 b3 N+b1 b2 N N b1 N+SL 劑量(Dose) 劑量(Dose) Dt De D(I0) 等效劑量的求取(Equivalent dose) 一、增加劑量法( Additive Dose Method) 二、再生法(Regeneration Method)

  10. 光螢光定年法 熱螢光定年法 製樣方式 粗粒法 細粒法 分析礦物 單一礦物 多種礦物組合 顆粒大小 63 - 300 m 4 - 11 m 測試溫度 低溫峰(110ºC) 高溫峰(375ºC) 年代範圍 最大可至100萬年 幾十萬年 起始值 接近底限值 難以估計 熱螢光與光螢光之比較

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