Rapid dating of recent sediments in Loch Ness: inductively coupled plasma mass spectrometric measurements of global fallout plutonium [An article from: Science of the Total Environment, The]
Rapid dating of recent sediments in Loch Ness: inductively coupled plasma mass spectrometric measurements of global fallout plutonium [An article from: Science of the Total Environment, The]
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Rapid dating of recent sediments in Loch Ness: inductively coupled plasma mass spectrometric measurements of global fallout plutonium [An article from: Science of the Total Environment, The]
This digital document is a journal article from Science of the Total Environment, The, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The ^2^3^9^+^2^4^0Pu activity profile is determined for a sediment core collected from 170-m depth at Loch Ness, Scotland. These measurements use magnetic sector inductively coupled plasma mass spectrometry for rapid determination of Pu activities and ^2^4^0Pu/^2^3^9Pu atom ratios. A ^2^3^9^+^2^4^0Pu detection limit of 0.1 Bq/kg is obtained for 2 g of acid-leached sediment; ^2^4^2Pu is used as a spike isotope. The Pu activity profile exhibits a maximum of 42.7+/-0.3 Bq/kg ^2^3^9^+^2^4^0Pu in the 9-10-cm depth interval. The position of this maximum coincides with peaks in the ^2^4^1Am and ^1^3^7Cs activity profiles. These peak activities are ascribed to the 1963/1964 peak fallout from atmospheric testing of nuclear weapons. The ^2^4^0Pu/^2^3^9Pu atom ratios are in the range 0.15-0.20, in agreement with the expected range of 0.166-0.194 for Northern Hemisphere fallout, and do not suggest the presence of other contributing sources. This study demonstrates that ICPMS has considerable potential for rapid determination of the chronology of post-1950 sediments, and also for validating ^2^1^0Pb dates where chronologies over longer time-scales are needed.
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Tags: article, Coupled, Dating, Environment, fallout, From, Global, Inductively, Loch, Mass, Measurements, Ness, Plasma, plutonium, rapid, Recent, Science, sediments, Spectrometric, Total
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