학술논문
Short communication: Synchrotron-based elemental mapping of single grains to investigate variable infrared-radiofluorescence emissions for luminescence dating
Document Type
Report
Author abstract
Author abstract
Author
Source
Geochronology. March 5, 2024, Vol. 6 Issue 1, p77.
Subject
Language
English
Abstract
During ionizing irradiation, potassium (K)-rich feldspar grains emit infrared (IR) light, which is used for infrared radiofluorescence (IR-RF) dating. The late-saturating IR-RF emission centred at â¼880 nm represents a promising tool to date Quaternary sediments. In the present work, we report the presence of individual grains in the K-feldspar density fraction displaying an aberrant IR-RF signal shape, whose combined intensity contaminates the sum signal of an aliquot composed of dozens of grains. Our experiments were carried out at the National Synchrotron Light Source (NSLS-II) at the submicron-resolution X-ray spectroscopy (SRX) beamline. We analysed coarse (90 µm) K-feldspar-bearing grains of five samples of different ages and origin in order to characterize the composition of grains yielding the desired or contaminated IR-RF emission. Using micro-X-ray fluorescence (μ-XRF), we successfully acquired element distribution maps of up to 15 elements (
Byline: Mariana Sontag-González, Raju Kumar, Jean-Luc Schwenninger, Juergen Thieme, Sebastian Kreutzer, Marine Frouin To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: https://gchron.copernicus.org/articles/6/77/2024/gchron-6-77-2024.html [...]
Byline: Mariana Sontag-González, Raju Kumar, Jean-Luc Schwenninger, Juergen Thieme, Sebastian Kreutzer, Marine Frouin To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: https://gchron.copernicus.org/articles/6/77/2024/gchron-6-77-2024.html [...]