01-02-2008· (iv) Feldspars suffer from anomalous (athermal) fading. For all these reasons, it is usually necessary to separate quartz and feldspar OSL signals to obtain useful quartz dose estimates. The standard approach to this is by physical/chemical separation in the laboratory using well-established chemical procedures (Wintle, 1997).
Single Quartz OSL ages can be determined typically from 100 to 350,000 years BP, and can be reliable when suitable methods are used and proper checks are done. Feldspar IRSL techniques have the potential to extend the datable range out to a million years as feldspars typically have significantly higher dose saturation levels than quartz, though issues regarding anomalous fading will need to be ...
OSL signal may limit the ability to obtain older ages (e.g. Chapot et al., 2012), therefore we need to consider a different luminescence chronometer. Feldspars have been suggested as a dosimeter that can be used to extend luminescence dating beyond the rangecoveredby quartz OSL (e.g. Buylaert et al., 2012). The post-infrared infrared stimu-
Minerals such as quartz Laboratory for Luminescence Dating identifies about 10% of and feldspars are commonly used in luminescence based ret- all quartz samples as significantly contaminated (in terms of rospective dosimetry techniques because of their abundance in OSL signals) by feldspar (out of an annual throughput of ∼800 the natural environment.
Natural sediments usually contain a mix of quartz and feldspar. Because these two minerals have different luminescence properties and record different natural doses it is normally necessary to physically separate them before measurement. This paper investigates the potential of using pulsed stimulation to separate the optically stimulated luminescence signals from quartz and feldspar.
01-09-2012· Furthermore, the shape of the decay can be diagnostic: quartz OSL is typically a rapid decay dominated by the fast component, while feldspar OSL is more gradual (Rhodes, 2011). Linearly modulated (LM-OSL) offers greater analytical power, as the quartz signal is the sum of several exponential decays ( Smith and Rhodes, 1994 ; Bulur et al., 1999 ), while feldspar IRSL generally …
01-09-2012· While Duller (2003) felt that decay shape was a poor marker of contamination, LM-OSL offers more numerical analysis of feldspar and quartz components decay curves than in CW-OSL, with multiple exponentials discernable through curve fitting for feldspars (Bulur, 1996) and for quartz …
T1 - Study of sensitivity change of OSL signals from quartz and feldspars as a function of preheat temperature. AU - Jungner, H. AU - Bøtter-Jensen, L. PY - 1994. Y1 - 1994. N2 - Optically stimulated luminescence (OSL) signals from feldspar and quartz samples were studied using infrared (860 nm) and green light (420-575 nm) stimulation.
As a result, when dating feldspars, it is necessary to separate K-feldspars from Osl and Na-feldspars and analyze them separately. Compared with quartz, feldspar has a number of attractive luminescence features. First, feldspar emissions are generally brighter than those from quartz …
01-08-2006· Time-resolved infrared optically stimulated luminescence (IR-OSL) signals of K- and Na-feldspar samples extracted from sediments were measured in UV, blue and red detection windows, using a fast photon counter and pulsed IR stimulation (λ = 875 nm).We observe that the relative contribution of long lifetime (∼ 20 μ s) components in K-feldspars is greater than that in Na-feldspars at each ...
For pulsed IR-OSL, the signal was collected between 10 and 100 mu s after the diodes were switched off, to avoid all contributions from short lifetime components. In all cases, the pulsed D-e values were larger than the CW D-e values, regardless of the type of the feldspar and the detection wavelength; the pulsed D-e values were also all consistent with those calculated from the quartz D-e.
PDF | The applicability of the single-aliquot regenerative-dose (SAR) protocol, by using the optically stimulated luminescence (OSL) signal of quartz as... | Find, read and cite all the research ...
4.5 Relation between TL and OSL Signals from Quartz 80 4.6 Luminescence Sensitivity Changes inQuartz as a Result of Annealing 82 4.7 Low-Dose OSL Properties of Quartz Extracted from Fired Materials 89 4.8 Conclusions - Quartz 93 5 OSL Characteristics of Feldspars 94 5.1 Introduction 94
Approval of the thesis: TIME-RESOLVED OPTICALLY STIMULATED LUMINESCENCE (OSL) STUDIES ON SAMPLES CONTAINING QUARTZ AND FELDSPAR submitted by AYDAN YELTİK in partial fulfillment of the requirements for the degree of Master of Science in Physics Department, Middle East Technical University by, Prof. Dr. Canan Özgen
It is known that the pulsed optically stimulated luminescence (OSL) characteristics of quartz and feldspars are very different. These differences can be used to preferentially discriminate against the feldspar signal in mixed quartzfeldspar mineral assemblages, or in separated quartz contaminated with a feldspar signal.
01-04-2003· Generally, the quartz grains have less than 3% of their OSL signal remaining after 0.40 s, although there are a few with values above 5%. In contrast, the feldspars have anywhere between 5% and 30% of their signal remaining.
source, quartz shows luminescence emission during OSL and TL measurements, however, very weakly under IRSL stimulation; feldspars show emission under all three kinds of stimulation. The thermoluminescence signal may be assigned to quartz or feldspars because those minerals differ in temperatures at which emission occurs. The
A Simple Method to Separate Quartz and Feldspar and its Application to TL/OSL Methods. Download. Related Papers. Luminescence dating: basics, methods and applications. By Daniel Richter.
OSL dating of quartz and feldspars from archaeological materials. / Mejdahl, V.; Bøtter-Jensen, L. 1993. Abstract from 7th International Specialist Seminar on Thermoluminescence and Electron Spin Resonance, Krems, Austria.
OSL dating is predicated on measurements of a specific mineral and particle size, usually quartz or potassium feldspar. Mineral separations are performed by standard techniques using heavy liquids and hydrofluoric acid (HF) to digest non-quartz minerals and etch the outer 10 to 20 µm of quartz grains which are affected alpha radiation.
Bøtter-Jensen, L, Jungner, H & Mejdahl, V 1992, ' Recent developments of OSL techniques for dating quartz and feldspars ', 10th International Conference on Solid State Dosimetry, Washington, United States, 13/07/1992 - 17/07/1992.
Request PDF | On Sep 15, 2001, Yorinao Shitaoka and others published Studies on OSL of Quartz and Feldspar for Dating of Sediments. | Find, read and cite all the research you need on ResearchGate