Journal ArticleDOI
Analysis for naturally occuring radionuclides at environmental concentrations by gamma spectrometry
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TLDR
The analytical potential of low level, high resolution gamma-ray spectrometry for naturally occurring radionuclides at environmental levels is described, with particular emphasis on detector background levels and sensitivity as mentioned in this paper.Abstract:
The analytical potential of low level, high resolution gamma-ray spectrometry for naturally occurring radionuclides at environmental levels is described, with particular emphasis on detector background levels and sensitivity. Comparisons are drawn between the performance of a specially designed low background detector system, and that of standard “off the shelf” devices. Sample characteristics, calibration procedures and checks, are described, and empirical minimum detection limits of between 0.4 Bq·kg−1 (226Ra,228Th) and 10 Bq·kg−1 (210Pb) are derived for soil or sediment samples of about 250 g. Representative analyses of a variety of environmental samples, including water, plant material, animal tissue and sediment, are given to illustrate the routine use of the spectrometer.read more
Citations
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Journal ArticleDOI
Late quaternary ice sheet history of northern Eurasia
John Inge Svendsen,Helena Alexanderson,Valery Astakhov,Igor Demidov,Julian A. Dowdeswell,Svend Funder,Valery Gataullin,Mona Henriksen,Christian Hjort,Michael Houmark-Nielsen,Hans Hubberten,Ólafur Ingólfsson,Martin Jakobsson,Kurt H. Kjær,Eiliv Larsen,Hanna Lokrantz,Juha Pekka Lunkka,Astrid Lyså,Jan Mangerud,Alexei Matiouchkov,Andrew S. Murray,Per Möller,Frank Niessen,Olga Nikolskaya,Leonid Polyak,Matti Saarnisto,Christine Siegert,Martin J. Siegert,Robert F Spielhagen,Ruediger Stein +29 more
TL;DR: In this paper, the maximum limits of the Eurasian ice sheets during four glaciations have been reconstructed: (1) the Late Saalian (>140 ka), (2) the Early Weichselian (100-80 ka),(3) the Middle Weichsellian (60-50 ka), and (4) the late Weichselsian (25-15 ka) based on satellite data and aerial photographs combined with geological field investigations in Russia and Siberia, and with marine seismic and sediment core data.
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A robust feldspar luminescence dating method for Middle and Late Pleistocene sediments
Jan-Pieter Buylaert,Jan-Pieter Buylaert,Mayank Jain,Andrew S. Murray,Kristina Jørkov Thomsen,Christine Thiel,Christine Thiel,Reza Sohbati +7 more
TL;DR: In this paper, the authors proposed a post-IR IRSL (IRSL) method for the dating of Middle and Late Pleistocene sediments, which appears to avoid signal instability.
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Thermoluminescence dating of a 50,000-year-old human occupation site in northern Australia
TL;DR: In this article, thermoluminescence (TL) dates were obtained from sandy footslope deposits at two former occupation sites that yielded a range of stone artefacts in their primary depositional setting.
Journal ArticleDOI
The distribution of apparent dose as determined by Optically Stimulated Luminescence in small aliquots of fluvial quartz: Implications for dating young sediments
TL;DR: In this paper, the authors examined the distribution of apparent dose in small aliquots (each composed of ∼2000 grains) of different particle size fractions (63-90μm, 90-125mm, 125-180mm, 180-212mm, and 250-250mm diameter) from two samples collected from the Murrumbidgee River, New South Wales, Australia.
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The effects of disequilibria in the uranium and thorium decay chains on burial dose rates in fluvial sediments
TL;DR: In this article, the authors present data from a variety of fluvial and lacustrine depositional environments, and demonstrate that disequilibria is common in these Australian surficial sediments.
References
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Journal ArticleDOI
Direct analysis of 210Pb in sediment samples: Self-absorption corrections
TL;DR: In this paper, a direct γ-ray instrumental analysis of 210Pb in sediment samples is presented, where the dependence of self-absorption on sample composition is solved by making a direct transmission measurement on each sample.
Journal ArticleDOI
Coincidence summing corrections in Ge(Li)-spectrometry at low source-to-detector distances
K. Debertin,U. Schötzig +1 more
TL;DR: In this paper, the correction factors for the same geometries for the most abundant lines of 18 radionuclides were calculated experimentally, and the correction factor was found to vary between 1.0 and 1.5 depending on the particular decay scheme.
Journal ArticleDOI
.gamma.-Ray spectrometry for determination of radium-228 and radium-226 in natural waters
TL;DR: In this paper, a technique was developed for the measurement of /sup 228/Ra and /sup 226/Ra in both fresh and seawater using Ge(Li)..gamma..-ray spectrometry.
Journal ArticleDOI
A versatile Ge(Li)-NaI(Tl) coincidence-anticoincidence gamma-ray spectrometer for environmental and biological problems
J.A. Cooper,R.W. Perkins +1 more
TL;DR: A high-sensitivity gamma-ray spectrometer incorporating a high-performance Ge(Li) detector and a NaI(Tl) well detector has been developed in this paper.
Journal ArticleDOI
Radium-224 in natural waters measured by γ-ray spectrometry
TL;DR: In this paper, a method based on Ge(Li) γ-ray spectrometry was applied to the determination of 224Ra (t 1 2 = 3.64 days) in natural waters.
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