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In instances where separations are difficult to effect with one GC, targeted compounds or regions of the chromatogram are isolated and re-injected into the second GC.Finally, up to six specified peaks are isolated in the preparative fraction collector.The system consists of two HP6890 gas chromatographs (GC) in series with a Gerstel preparative fraction collector attached at the end.Sample extracts containing suites of very similar molecules, e.g., a homologous series of n-alkanes, are injected repeatedly onto a high-capacity megabore capillary column in the first GC to separate and resolve individual molecules.In questo modo il carbonio-14 si trasferisce nei composti organici e, attraverso la rete alimentare, è presente ovunque secondo un preciso rapporto (abbondanza isotopica).Essa penetra anche negli oceani, sciogliendosi nell'acqua.Even with the power of capillary GC resolution and the high capacity of megabore columns, it is still difficult to collect enough sample for a radiocarbon measurement.

The NOSAMS facility provides proven designs for sample-preparation systems and our staff have trained many students, technicians and investigators to use them.I test nucleari superficiali che vennero eseguiti in molti paesi tra il 1945 e il 1980 hanno drammaticamente aumentato la quantità di carbonio-14 nell'atmosfera e quindi anche nella biosfera.Da quando i test sono stati sospesi la concentrazione dell'isotopo ha cominciato a diminuire.Mark Kurz, ( current director of NOSAMS) is a geochemist whose research activities include: isotope geochemistry of mantle derived rocks and minerals, evolution of oceanic volcanoes, cosmic-ray produced nuclides in rocks and their application to geochronology, and evolution of the mantle-continent-atmosphere system.Mark Roberts, staff physicist, is responsible for operation and continued development of both the CFAMS and US-AMS systems at NOSAMS.

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