TY - JOUR T1 - A Continuous-Flow Gas Chromatography C-14 Accelerator Mass Spectrometry System JF - Radiocarbon Y1 - 2010 A1 - McIntyre, C. P. A1 - Galutschek, E. A1 - Roberts, M. L. A1 - von Reden, K. F. A1 - McNichol, A. P. A1 - Jenkins, W. J. KW - ams system KW - gc-ams KW - negative-ion source KW - RADIOCARBON ANALYSIS AB - Gas-accepting ion sources for radiocarbon accelerator mass spectrometry (AMS) have permitted the direct analysis of CO2 gas, eliminating the need to graphitize samples. As a result, a variety of analytical instruments can be interfaced to an AMS system, processing time is decreased, and smaller samples can be analyzed (albeit with lower precision). We have coupled a gas chromatograph to a compact C-14 AMS system fitted with a microwave ion source for real-time compound-specific C-14 analysis. As an initial test of the system, we have analyzed a sample of fatty acid methyl esters and biodiesel. Peak shape and memory was better then existing systems fitted with a hybrid ion source while precision was comparable. C-14/C-12 ratios of individual components at natural abundance levels were consistent with those determined by conventional methods. Continuing refinements to the ion source are expected to improve the performance and scope of the instrument. VL - 52 SN - 0033-8222 IS - 2 N1 - Sp. Iss. 1696jn Times Cited:4 Cited References Count:24 JO - Radiocarbon ER - TY - JOUR T1 - A High-Performance (14)c Accelerator Mass Spectrometry System JF - Radiocarbon Y1 - 2010 A1 - Roberts, M. L. A1 - Burton, J. R. A1 - Elder, K. L. A1 - Longworth, B. E. A1 - McIntyre, C. P. A1 - von Reden, K. F. A1 - Han, B. X. A1 - Rosenheim, B. E. A1 - W. J. Jenkins A1 - Galutschek, E. A1 - McNichol, A. P. AB - A new and unique radiocarbon accelerator mass spectrometry (AMS) facility has been constructed at the Woods Hole Oceanographic Institution. The defining characteristic of the new system is its large-gap optical elements that provide a larger-than-standard beam acceptance. Such a system is ideally suited for high-throughput, high-precision measurements of (14)C. Details and performance of the new system are presented. VL - 52 IS - 2 N1 - id: 2095; PT: J; CT: 20th International Radiocarbon Conference; CY: MAY 31-JUN 05, 2009; CL: Big Isl, HI; SI: 1; UT: WOS:000285437800005 JO - A High-Performance (14)c Accelerator Mass Spectrometry System ER -