Two years since SSAMS: Status of 14C AMS at CAIS

Prasad, Ganesh; Cherkinsky, Alexander; Culp, Randy; Dvoracek, Doug

doi:10.1016/j.nimb.2015.06.033

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…In an earlier article (Prasad et al 2019), we discussed the stable isotope ratios from 500 kV CAMS and 250 kV SSAMS. We find that IRMS δ 13 C values consistently resulted in accurate pMC values for high beam currents in the range of 60-100 μA (Prasad et al 2013(Prasad et al , 2015. It may be worth noting that in all these cases, the beam currents of standards and samples of a given sample group are in the same range.…”

Section: Introductionmentioning

confidence: 55%

Effect of Beam Transmission of Stable Isotopes on Online δ¹³C for SSAMS

2019

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It is known that 12C beam transmission through the accelerator decreases at high beam currents. This effect depends on machine design and varies across different types of AMS instruments. For beam currents of about 100 μA, the effect is small on the 500 kV tandem CAMS unit, whereas beam saturation is observed for similar high beam currents on the 250 kV SSAMS unit. While this effect is very evident for high 12C beam currents, we have also observed that even the 13C beam is found to suffer modest transmission loss with beam current. As a result, the 13C/12C ratio does not remain constant with beam current. By correcting for the effects of 12C beam saturation and decreased 13C transmission, we have obtained online δ13C values that are more accurate and precise at moderately high beam currents for SSAMS.

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Section: Introductionmentioning

confidence: 55%

Effect of Beam Transmission of Stable Isotopes on Online δ¹³C for SSAMS

2019

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“…Figure 1 also shows that we did not measure many samples in 2016 and 2017 due to maintenance on our LAC-UFF Status Report 1239 SSAMS system. During these years we have our graphite sent to the CAIS (Ravi Prasad et al 2015) and to the ANU (Fallon et al 2010).…”

Section: Resultsmentioning

confidence: 99%

“…Occasionally, when the system is under maintenance, we have our graphite sent to the Center of Applied Isotopes Studies (CAIS) at the University of Georgia, in the United States (Ravi Prasad et al 2015) and to the Australian National University (ANU) Radiocarbon Dating Centre (Fallon et al 2010).…”

Section: Measurementmentioning

confidence: 99%

Lac-Uff Status Report: Current Protocols and Recent Developments

et al. 2021

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The Radiocarbon Laboratory of the Fluminense Federal University was installed in 2009, and its NEC Single Stage Accelerator Mass Spectrometry system has been operational since 2012. As the first 14C-AMS facility in Latin America, the LAC-UFF became a reference center for radiocarbon (14C) dating in Brazil. Over the years we have implemented pretreatment protocols for several kinds of materials, such as cellulose, soil, bone, and biofuels. In the present paper we describe our current protocols for the preparation of these types of samples. Moreover, after 10 years of operation, with the aim of expanding the range of materials we are able to analyze, we report the results of several tests to improve accuracy, precision and background levels. For example, here we discuss how isotopic fractionation during the graphitization and measurement steps has been controlled. Concerning results interpretation, our research group has been using OxCal chronological models to analyze different contexts such as stromatolite growth, tree rings, soil deposition and marine reservoir effect (MRE) determination.

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“…The open air single stage accelerator mass spectrometry (SSAMS) system and the compact AMS system (MICADAS) which have these advantages for radiocarbon ( 14 C) measurement have been successfully developed by NEC and ETH, respectively (Klody et al 2005;Synal et al 2007). These two systems were delivered to many AMS laboratories and are in use for routine 14 C measurement (Skog 2007;Bard et al 2015;Linares et al 2015;Ravi Prasad et al 2015;Salehpour et al 2016). In order to develop 14 C measurement with compact AMS system at CIAE, the first home-made singlestage AMS system in China for 14 C measurement was set up in 2016.…”

Section: Introductionmentioning

confidence: 99%

Performance of Home-Made Single-Stage ¹⁴C AMS System at CIAE

Pang

Yang

et al. 2019

Radiocarbon

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The second home-made single stage accelerator mass spectrometer (SSAMS) system dedicated to radiocarbon (14C) measurements was built after the first SSAMS system was moved to Guangxi Normal University. With some improvements to the second SSAMS system, the performance has been improved. With the conditions of total ion energy of 200KeV, ions charge states of 1+ and helium as stripper gas, 14C measurements with precision of 0.5% and a background level of 0.5 pMC were achieved. Details of the system and the experimental performance are given here.

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Two years since SSAMS: Status of 14C AMS at CAIS

Cited by 6 publications

References 4 publications

Effect of Beam Transmission of Stable Isotopes on Online δ¹³C for SSAMS

Effect of Beam Transmission of Stable Isotopes on Online δ¹³C for SSAMS

Lac-Uff Status Report: Current Protocols and Recent Developments

Performance of Home-Made Single-Stage ¹⁴C AMS System at CIAE

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Two years since SSAMS: Status of 14C AMS at CAIS

Cited by 6 publications

References 4 publications

Effect of Beam Transmission of Stable Isotopes on Online δ13C for SSAMS

Effect of Beam Transmission of Stable Isotopes on Online δ13C for SSAMS

Lac-Uff Status Report: Current Protocols and Recent Developments

Performance of Home-Made Single-Stage 14C AMS System at CIAE

Contact Info

Product

Resources

About

Effect of Beam Transmission of Stable Isotopes on Online δ¹³C for SSAMS

Effect of Beam Transmission of Stable Isotopes on Online δ¹³C for SSAMS

Performance of Home-Made Single-Stage ¹⁴C AMS System at CIAE