Optically stimulated luminescence cross-dating from quartz of different grain size

Q3 Engineering

Acta IMEKO Pub Date : 2023-11-21 DOI:10.21014/actaimeko.v12i4.1523

R. Galvagno, A. D'anna, Agata Di Stefano, Francesca La Perna, Graziana Mendosa, G. Politi, G. Stella, A. Gueli

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引用次数: 0

Abstract

Optically stimulated luminescence (OSL) signals from quartz can be used to determine when a sample was last exposed to sunlight. The total specific energy (dose) absorbed since the last resetting is measured using OSL, and divided by the rate of storage (dose rate) to give the time elapsed from the last heating or daylight exposure. The general equation used to determine the age in luminescence dating is given by the ratio between the Equivalent Dose (ED) and the Annual Dose rate (AD). The ED, measured using luminescence signals, is the total absorbed dose starting from the last "zero event" while the AD, evaluated by in situ and extra situ radioactivity measurements, represents the rate at which energy is absorbed from natural radioactivity present in the sample and in the environment. Evaluation of the environmental dose rate component becomes a crucial point in dating since particular conditions of the site (heterogeneity, lack of structure...) could make age measurement inaccurate. In this work, the conditions for applicability of subtraction dating are tested on a sediment of known age; it allows an age determination that is independent of knowledge of the environmental dose-rate.

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不同粒度石英的光激发发光交叉定年

石英的光激发发光（OSL）信号可用于确定样品最后一次暴露在阳光下的时间。使用 OSL 测量自上次重置以来吸收的总特定能量（剂量），然后除以存储率（剂量率），得出自上次加热或日光照射以来的时间。用于确定发光年代的一般公式是等效剂量（ED）与年剂量率（AD）之比。等效剂量（ED）通过发光信号测量，是指从最后一次 "零事件 "开始的总吸收剂量，而年剂量率（AD）则通过原位和非原位放射性测量评估，表示从样品和环境中存在的天然放射性中吸收能量的速率。对环境剂量率成分的评估是年代测定中的一个关键点，因为遗址的特殊条件（异质性、缺乏结构......）可能导致年代测量不准确。在这项工作中，我们在已知年龄的沉积物上测试了减法测年的适用条件；它可以在不了解环境剂量率的情况下确定年龄。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta IMEKO Engineering-Mechanical Engineering

CiteScore

2.50

自引率

0.00%

发文量

期刊介绍： The main goal of this journal is the enhancement of academic activities of IMEKO and a wider dissemination of scientific output from IMEKO TC events. High-quality papers presented at IMEKO conferences, workshops or congresses are seleted by the event organizers and the authors are invited to publish an enhanced version of their paper in this journal. The journal also publishes scientific articles on measurement and instrumentation not related to an IMEKO event.