Improved Precision of Radiocarbon Measurements for CH<sub>4</sub> and CO<sub>2</sub> Using GC and Continuous-Flow AMS Achieved by Summation of Repeated Injections

McIntyre, Cameron; McNichol, Ann P.; Roberts, M.L.; Seewald, Jeffrey S.; Reden, Karl F. von; Jenkins, William J.

doi:10.1017/s0033822200057830

Cited by 6 publications

(3 citation statements)

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“…[26]), and for gaseous carbon samples (e.g. [27,28]). In order to estimate the limit of sample size, it is convenient to start with a sample of 1 mg C with a modern 14 C/ 12 C isotopic ratio of 1.2 × 10 −12 .…”

Section: Reduction Of Sample Sizementioning

confidence: 99%

“…Going below 10-μg C reduces the statistical uncertainty correspondingly, but the real limitations are uncertainties from various background sources [26]. The direct use of CO 2 gas in the sputter ion source [27,28] avoids the graphitization step for solid C targets [26] and thus reduces the procedural uncertainty. However, the ionization yield for C − production is considerably lower from CO 2 gas (~ factor of 10), and finite memory effects are another problem to be addressed.…”

Section: Reduction Of Sample Sizementioning

confidence: 99%

“…[26] still seem to be somewhat superior. On the other hand, the increasing interest in compound-specific 14 C measurements with on-line chromatographic analysis prior to the AMS measurement favours the use of gaseous sample material [28].…”

Section: Reduction Of Sample Sizementioning

confidence: 99%

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Accelerator mass spectrometry: state of the art and perspectives

Kutschera

2016

Advances in Physics: X

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Accelerator mass spectrometry (AMS) is sometimes called 'the art of counting atoms one by one'. In addition to counting individual atoms, AMS is also capable to determine both mass number (A) and atomic number (Z). Since an atom (also called a nuclide) is unambiguously characterized by the proton number (Z) and the neutron number (N = A − Z), a rare nuclide can be well separated from possible background events, and extremely low abundances of specific nuclides can be measured. In general, the use of an accelerator system as a mass spectrometer improves the isotope abundance sensitivity by many orders of magnitude as compared to standard mass spectrometry (without an accelerator). In particular, AMS provides the means to measure minute traces of long-lived radioisotopes of cosmogenic and/or anthropogenic origin in essentially every domain of our environment at large. This allows one to use AMS for performing research in many different areas, ranging from archaeology to astrophysics. In this review, an update of the current status of AMS and an outlook to future developments in both technical and applied aspects will be presented. The transition from Mass Spectrometry (MS) to Accelera tor Mass Spectrometry (AMS)

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Section: Reduction Of Sample Sizementioning

confidence: 99%