Skip to main content Accessibility help
×
Home

EFFECT OF BEAM TRANSMISSION OF STABLE ISOTOPES ON ONLINE δ13C FOR SSAMS

  • G V Ravi Prasad (a1), Alexander Cherkinsky (a1) and Randy Culp (a1)

Abstract

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.

Copyright

Corresponding author

*Corresponding author. Email: gvrp@uga.edu.

Footnotes

Hide All

Selected Papers from the 23rd International Radiocarbon Conference, Trondheim, Norway, 17–22 June, 2018

Footnotes

References

Hide All
Bard, E, Tuna, T, Fagault, Y, Bonvalot, L, Wacker, L, Fahrni, S, Synal, HA. 2015. AixMICADAS, the accelerator mass spectrometer dedicated to 14C recently installed in Aix-en-Provence, France. Nuclear Instruments and Methods in Physics Research B 361:8086.
Calvo, EC, Santos, FJ, Lopez-Gutierrez, JM, Padilla, S, Garcia-Leon, M, Heinemeier, J, Schnabel, C, Scognamiglio, G. 2015. Status report of the 1 MV AMS facility at the Centro Nacional de Aceleradores. Nuclear Instruments and Methods in Physics Research B 361:1319.
Freeman, SPHT, Dougans, A, McHargue, L, Wilcken, KM, Xu, S. 2008. Performance of the new single stage accelerator mass spectrometer at the SUERC. Nuclear Instruments and Methods in Physics Research B 266:22252228.
Freeman, SPHT, Cook, GT, Dougans, A, Naysmith, P, Wilcken, KM, Xu, S. 2010. Improved SSAMS performance. Nuclear Instruments and Methods in Physics Research B 268:715717.
Linares, R, Macario, KD, Santos, GM, Carvalho, C, dos Santos, HC, Gomes, PRS, Castro, MD, Oliveira, FM, Alves, EQ. 2015. Radiocarbon measurements at LAC-UFF: recent performance. Nuclear Instruments and Methods in Physics Research B 361:341345.
Prasad, GVR, Noakes, JE, Cherkinsky, A, Culp, R, Dvoracek, D. 2013. The new 250kV single stage AMS system at CAIS, university of Georgia: performance comparison with a 500kV compact tandem machine. Radiocarbon 55:319324.
Prasad, GVR, Cherkinsky, A, Culp, R, Dvoracek, D. 2015. Two years since SSAMS: Status of 14C AMS at CAIS. Nuclear Instruments and Methods in Physics Research B 361:6971
Prasad, GVR, Culp, R, Cherkinsky, A. 2019. δ13C correction to AMS data: values derived from AMS vs IRMS values. Nuclear Instruments and Methods in Physics Research B 455:244249
Skog, G. 2007. The single stage AMS machine at Lund University: status report. Nuclear Instruments and methods in Physics Research B 259:16.
Skog, G, Rundgren, M, Skold, P. 2010. Status of the Single Stage AMS machine at Lund University after 4 years of operation. Nuclear Instruments and Methods in Physics Research B 268:895897.
Synal, HA, Stocker, M, Suter, M. 2007. MICADAS: a new compact radiocarbon AMS system. Nuclear Instruments and Methods in Physics Research B 259:713.

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed