Optical dating: bleaching experiment on IRSL signals  from loess samples

Zhang Jingzhao  Lai Zhongping

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Optical dating: bleaching experiment on IRSL signals from loess samples

更新时间：2021-04-09

- Optical dating: bleaching experiment on IRSL signals from loess samples
- NUCLEAR TECHNIQUES Issue 8, (1997)
- 作者机构：
  
  中国科学院黄土与第四纪地质国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TL81
- Published：01 August 1997
- 稿件说明：
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[1]张景昭,赖忠平.光释光测年:　黄土样品 IRSL 信号的晒退实验[J].核技术,1997(08):37-40.

Zhang Jingzhao Lai Zhongping. Optical dating: bleaching experiment on IRSL signals from loess samples[J]. Nuclear techniques, 1997, (8).
[1]张景昭,赖忠平.光释光测年:　黄土样品 IRSL 信号的晒退实验[J].核技术,1997(08):37-40. DOI：

Zhang Jingzhao Lai Zhongping. Optical dating: bleaching experiment on IRSL signals from loess samples[J]. Nuclear techniques, 1997, (8). DOI：

摘要

用１８个（６×３）２．５Ｖ的红色发光二极管（中心波长是６５５ｎｍ）做成的照明光源，在６０ｍｉｎ内对黄土样品的红外释光（ＩＲＳＬ）信号几乎没有激发，因而可作为ＩＲＳＬ样品前处理的照明光源。两个黄土样品的光晒退实验表明，若样品在阳光下曝光２０ｍｉｎ，其ＩＲＳＬ信号即可降至２％以下（归一化通过短打进行），而最终残留值则低于１％。通过测定，渭河表面样ＩＲＳＬ的等效剂量值为０．５１Ｇｙ。这说明用ＩＲ激发，即使测定非常年轻的黄土样品的年龄也可不计残留值的影响。同时也显示了ＩＲ激发在测定黄土区河湖相、甚至洪积相等曝光时间很短的沉积物的年龄方面有很大潜力。晒退后的样片在室温下放置８天后，即使再预热也没有明显的回授现象发生，这表明用ＩＲＳＬ测定黄土年龄时其底限比绿光释光的要低得多。

Abstract

A kind of red LEDs with a wavelength of 655nm provides light illumination of loess samples while pretreating the samples with minimal effect on the latent IRSL. The IRSL signal is decreased to two percent after 20 minutes bleaching by sun light. It implies that the residual signals may be neglected even when dating very young loess samples

and that IRSL dating has significant potential in dating very poorly-bleached sediments. The recuperation of IRSL in loess is negligible

so the measurable age limit for IRSL is much lower than that for GLSL.

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Related Institution

State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’An 710075, China) 2

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Institute of Hydrogeology and Environmental Geology, CAGS

Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Qinghai 810008,China) 2

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