![Intercomparison of alpha and gamma spectrometry techniques used in ^2^1^0Pb geochronology [An article from: Journal of Environmental Radioactivity]](https://www.ebooknetworking.net/books/noimage.jpg)
Intercomparison of alpha and gamma spectrometry techniques used in ^2^1^0Pb geochronology [An article from: Journal of Environmental Radioactivity]
Book Details
PublisherElsevier
ISBN / ASINB000PDT2PQ
ISBN-13978B000PDT2P0
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Journal of Environmental Radioactivity, published by Elsevier in 2007. 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:
^2^1^0Pb geochronology is a widely used tool in sedimentological studies aimed at the absolute ages of modern sediments (up to 100 years). ^2^1^0Pb activities required to model sedimentation regimes are measured using either alpha, gamma or beta spectrometry. Sediment accumulation rates derived from ^2^1^0Pb activity profiles measured by these methods are often used interchangeably in mass balance studies. Yet there is a lack of investigations considering the comparability of data derived using different analytical methods. Differences between methods could be caused by different behaviors of ^2^1^0Pb and ^2^1^0Po (used for alpha measurement) in the marine environment. In gamma spectrometry errors may arise when many gamma emitters are measured simultaneously and their activity peaks overlap. In alpha spectrometry chemical separation of ^2^1^0Po may result in analytical error due to incomplete sample dissolution. In the present study we evaluate total, supported and excess ^2^1^0Pb activities and their use in deriving sediment accumulation rates and ^2^1^0Pb excess inventories for three sediment cores collected from the Barents Sea. ^2^1^0Pb activities derived by alpha and gamma methods are shown to agree within counting error and there is also good agreement in the derived sediment accumulation rates. The inherent compatibility of analytical results based on alpha or gamma techniques is established.
Description:
^2^1^0Pb geochronology is a widely used tool in sedimentological studies aimed at the absolute ages of modern sediments (up to 100 years). ^2^1^0Pb activities required to model sedimentation regimes are measured using either alpha, gamma or beta spectrometry. Sediment accumulation rates derived from ^2^1^0Pb activity profiles measured by these methods are often used interchangeably in mass balance studies. Yet there is a lack of investigations considering the comparability of data derived using different analytical methods. Differences between methods could be caused by different behaviors of ^2^1^0Pb and ^2^1^0Po (used for alpha measurement) in the marine environment. In gamma spectrometry errors may arise when many gamma emitters are measured simultaneously and their activity peaks overlap. In alpha spectrometry chemical separation of ^2^1^0Po may result in analytical error due to incomplete sample dissolution. In the present study we evaluate total, supported and excess ^2^1^0Pb activities and their use in deriving sediment accumulation rates and ^2^1^0Pb excess inventories for three sediment cores collected from the Barents Sea. ^2^1^0Pb activities derived by alpha and gamma methods are shown to agree within counting error and there is also good agreement in the derived sediment accumulation rates. The inherent compatibility of analytical results based on alpha or gamma techniques is established.
