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|Title:||Comparison of 41Ca analysis on 0.5 MV and 5 MV-AMS systems|
Accelerator Mass Spectrometry
|Source:||Schulze-König, T., Maden, C., Denk, E., Freeman, S.P.H.T., Stocker, M., Suter, M., Synal, H.-A., Walczyk, T. (2010-04). Comparison of 41Ca analysis on 0.5 MV and 5 MV-AMS systems. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms 268 (7-8) : 752-755. ScholarBank@NUS Repository. https://doi.org/10.1016/j.nimb.2009.10.022|
|Abstract:||A comparative study was made between the compact AMS system at the PSI/ETH Laboratory of Ion Beam Physics in Zurich with 0.5 MV terminal voltage and the 5 MV-AMS system at the Scottish Universities Environmental Research Centre (SUERC), Glasgow. Overall 34 urinary samples with 41Ca/40Ca ratios in the range from 4 × 10-11 to 3 × 10-10 were processed to CaF2 and aliquots of the same material were measured on both instruments. Measurements on the compact AMS system were performed in charge state 3+ achieving a transmission of 4% at 1.7 MeV beam energy. Under these conditions a suppression of the interference 41K is virtually impossible. However, samples with an excess of potassium can be identified by a shift of the 41Ca/41K peak in the ΔE - E histogram of the gas ionization detector employed and a criterion for data rejection can be defined. An overall precision of ∼4% and a 41Ca/40Ca background level of 5 × 10-12 have been reached. For studies with higher demands on the detection limit AMS systems like the one at SUERC are attractive: in charge state 5+ and using a gas stripper beam energy of 27 MeV, a transmission of 5%, a 41K suppression factor of ∼500 and a 41Ca/40Ca background level of 3 × 10-14 are achieved. We demonstrate that both systems are well suited for large-scale 41Ca biomedical applications. © 2009 Elsevier B.V. All rights reserved.|
|Source Title:||Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms|
|Appears in Collections:||Staff Publications|
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