Improved 36Cl AMS at 5MV

Wilcken, Klaus M.; Freeman, Stewart P.H.T.; Dougans, A.; Xu, Sheng; Loger, Roger; Schnabel, Christoph

doi:10.1016/j.nimb.2009.10.021

Cited by 23 publications

(9 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also possible molecular interferences are be dissociated in the stripper. Details of the AMS measurement procedure can be referred in [13]. Natural Cl content in rock was calculated by conventional isotope dilution.…”

Section: Methodsmentioning

confidence: 99%

In-situ cosmogenic 36Cl denudation rates of carbonates in Guizhou karst area

Liu

Freeman

et al. 2013

Chin. Sci. Bull.

View full text Add to dashboard Cite

This study quantifies surface denudation of carbonate rocks by the first application of in-situ cosmogenic 36 Cl in China. Concentrations of natural Cl and in-situ cosmogenic 36 Cl in bare carbonates from Guizhou karst areas were measured with isotope dilution by accelerator mass spectrometer. The Cl concentration varied from 16 to 206 ppm. The 36 Cl concentrations were in range of (0.8-2.4)10 6 atom g −1 , resulting in total denudation rates of 20-50 mm ka −1 that averaged over a 10 4 -10 5 a timescale. The 36 Cl-denudation rates showed roughly a negative correlation with the local mean temperature. This preliminary observation may suggest the variations of proportions of chemical weathering and physical erosion in denudation process, depending upon local climatic conditions. in-situ cosmogenic 36 Cl, denudation rate, climatic condition, carbonate, Guizhou Citation:Xu S, Liu C Q, Freeman S, et al. In-situ cosmogenic 36 Cl denudation rates of carbonates in Guizhou karst area.

show abstract

Section: Methodsmentioning

confidence: 99%

In-situ cosmogenic 36Cl denudation rates of carbonates in Guizhou karst area

Liu

Freeman

et al. 2013

Chin. Sci. Bull.

View full text Add to dashboard Cite

show abstract

“…We begin by summarising instrumental aspects of SUERC 36 Cl measurement that are already published [2,6]. First, negative ions towards the positively-biased terminal where they are passed through a thin gas and become positively charged.…”

Section: Suerc 36 CL Accelerator Mass Spectrometrymentioning

confidence: 99%

“…However, the challenge in 36 Cl AMS is to separate the 36 Cl signal from the interfering isobar 36 S. This can be done efficiently in a multi anode gas ionisation chamber as discussed in our earlier work [2,6]. Essential for good separation of 36 Cl and 36 S ions at low ion energies is to use thin and uniform detector window (30 nm silicon rich nitride membrane 10 Â 10 mm) [7,8] and to discriminate against scattered ions.…”

Section: Measurement Principlesmentioning

confidence: 99%

“…This has typically required large (10-15 MV) legacy nuclear physics particle accelerators but recently it has been shown that sufficient separation can be achieved with much lower ion energies than before ð$ 30 MeVÞ [2][3][4][5][6]; the accelerator mass spectrometer detector resolution being improved by using uniform thin ($30 nm) silicon rich nitride membranes that can hold differential pressures between the detector volume and rest of the spectrometer [7,8]. Thin uniform window in front of the detector will minimise energy losses and peak broadening.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

36Cl accelerator mass spectrometry with a bespoke instrument

Wilcken¹,

Freeman²,

Schnabel³

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

Self Cite

View full text Add to dashboard Cite

“…In the last decade, significant progress has been made in isobar separation using gas counters. The AMS laboratories SUERC [33] (30 MeV, 5 MV, 5+) and VERA [34,35] (24 MeV,3 MV, 7+) have demonstrated that without a degrader foil low background ( 36 Cl/Cl > 10 À15 ) can be obtained with much higher yields (4-10 times larger), which makes measuring time much shorter and more efficient. Such high yields will never be possible with the degrader foil technique.…”

Section: Discussionmentioning

confidence: 99%