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CEGS
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=== Other Configuration Options === For special applications (such as in situ cosmogenic radiocarbon dating, or ramped pyrolysis oxidation), additional dedicated inlet ports are frequently included, and other devices may be added, such as tube furnaces, tandem coil traps, and CO<sub>2</sub> analyzers. Where CO<sub>2</sub> splits for independent stable isotope (δ<sup>13</sup>C) analysis are required, the CEGS is fitted with a supplementary outlet manifold of gas ports. The gas split ports may be of two types. One has a fitting to accept a 6 mm pyrex tube to collect the split in a flame-sealable ampule ("ampule port"). The other type ("vial port") has a needle to pierce into a septum-sealed vial commonly used on IRMS gas bench autosamplers. With vial ports, the CEGS can automatically post-fill the vial to slightly over atmospheric pressure with inert gas (He or N2, not Ar) to facilitate processing at the IRMS lab.
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