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Analysis of the 1 MV CNA AMS system as a potential tool for 236U studies in Oceanography

AuthorsChamizo, Elena ; López-Lora, Mercedes; Villa-Alfageme, María; Casacuberta, Nuria; Pham, M. K.; López-Gutiérrez, J. M.
Issue Date2014
CitationAMS-13 (2014)
AbstractThe performance of 1 MV AMS system at the CNA for 236U measurements has been recently extensively investigated. A very promising 236U/238U abundance sensitivity for non-processed 236U free samples of about 3×10−11 has been achieved. This promising result opens the door to the use of conventional low energy AMS systems to 236U environmental applications. The aim of this work is to determine if the sensitivity achieved for 236U/238U is low enough to apply our system to the study of environmental processes based on 236U analysis. The first 236U results obtained on our AMS system for marine samples (sediments and water) are presented here. First, we focus on two sets of several sea-sediment aliquots from IAEA reference materials : IAEA-410, from the Bikini atoll, affected by the thermonuclear American tests ; and IAEA-412, from the Pacific Ocean, presumably free from local actinides sources. Preliminary results point out to a probable 236U speciation between the dissolved and the particulate phases in seawater, which favours the 236U concentration in the sediment. We conclude that our abundance sensitivity is competitive for the study of marine sediment cores, as is further illustrated by the 236U results obtained on a sediment core from the Porcupine Abyssal Plain in the North Atlantic [Chamizo et al. this conference]. Second, it is discussed the 236U/238U atomic ratio obtained on a set of 5 intercomparison sea-water samples from the North Atlantic Ocean provided by the ETH, Zürich, at the order of 10−12. Based on the environmental context of these samples, we discuss the versatility of the 1 MV CNA AMS and its optimization for the determination of actinides (i.e. U and Pu-isotopes). Finally, our prospects will be presented.
DescriptionResumen del póster presentado a la "Thirteenth International Conference on Accelerator Mass Spectrometry" celebrada en Aix-en-Provence (Francia) del 24 al 29 de agosto de 2014.
Appears in Collections:(CNA) Comunicaciones congresos
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