Accelerator mass spectrometry 14C determination in CO2 produced from laser decomposition of aragonite


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dc.contributor.author Rosenheim, Brad E.
dc.contributor.author Thorrold, Simon R.
dc.contributor.author Roberts, Mark L.
dc.date.accessioned 2009-05-20T12:47:48Z
dc.date.available 2009-05-20T12:47:48Z
dc.date.issued 2008-08-29
dc.identifier.uri http://hdl.handle.net/1912/2838
dc.description Author Posting. © John Wiley & Sons, 2008. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Rapid Communications in Mass Spectrometry 22 (2008): 3443-3449, doi:10.1002/rcm.3745. en
dc.description.abstract Determination of 14C in aragonite (CaCO3) decomposed thermally to CO2 using an yttrium‐aluminum‐garnet doped neodymium laser is reported. Laser decomposition accelerator mass spectrometer (LD‐AMS) measurements reproduce AMS determinations of 14C from conventional reaction of aragonite with concentrated phosphoric acid. The lack of significant differences between these sets of measurements indicate that LD‐AMS radiocarbon dating can overcome the significant fractionation that has been observed during stable isotope (C and O) laser decomposition analysis of different carbonate minerals. The laser regularly converted nearly 30% of material removed to CO2 despite being optimized for ablation, where laser energy breaks material apart rather than chemically altering it. These results illustrate promise for using laser decomposition on the front‐end of AMS systems that directly measure CO2 gas. The feasibility of such measurements depends on 1. the improvement of material removal and/or CO2 generation efficiency of the laser decomposition system and 2. the ionization efficiency of AMS systems measuring continuously flowing CO2. en
dc.description.sponsorship This work was funded on a competitive basis by the Cecil H. and Ida M. Green Technology Innovation Award of Woods Hole Oceanographic Institution. en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.relation.uri http://dx.doi.org/10.1002/rcm.3745
dc.title Accelerator mass spectrometry 14C determination in CO2 produced from laser decomposition of aragonite en
dc.type Preprint en

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