36Cl measurements at the Zürich AMS facility

Dittrich-Hannen, B.; Ames, F.; Suter, M.; Wagner, Michael J.; Schnabel, C.; Michel, R.; Herpers, U.; Günther, E.

doi:10.1016/0168-583x(94)95981-1

Cited by 44 publications

(23 citation statements)

References 20 publications

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“…General surface runoff rate in Pleistocene upland-alluvial lowland region is~20% (e.g. Kotoda, 1968;Kondoh, 1985), whereas surface runoff rate measured in an experimental field at the central part of the Tsukuba Upland is~5% (Itadera and Shimada, 1992 Synal et al, 1990), we obtained a scaling factor of 0.96 for the Tsukuba Upland (c.f. 2.5 based on the simplified latitudinal fallout distribution model by Lal and Peters, 1967).…”

mentioning

confidence: 89%

“…This may be partly attributed to the scarcity of information on the local fallout history of bomb-produced 36 Cl. According to Green et al (2004), the 36 Cl concentration profiles for ice cores from the Dye-3 site (Greenland) (Synal et al, 1990), the Inilchek Glacier (Kyrgyzstan) and the Guiliya Ice Cap (China) have almost identical shapes. From this result, one can assume that the fallout pattern of bomb-produced 36 Cl is essentially uniform in the northern hemisphere.…”

Section: Introductionmentioning

confidence: 99%

“…From this result, one can assume that the fallout pattern of bomb-produced 36 Cl is essentially uniform in the northern hemisphere. Accordingly, the local fallout history of bomb-produced 36 Cl can be estimated by scaling the Dye-3 fallout values (Synal et al, 1990), which is currently the only available detailed data on the 36 Cl bomb pulse. Therefore, the present study aims to reconstruct the local fallout history of bomb-produced 36 Cl.…”

Section: Introductionmentioning

confidence: 99%

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An Estimate of Local Bomb-Produced 36Cl Fallout Using the Depth Profile of Groundwater in the Tsukuba Upland, Central Japan

Tosaki

Tase

Yasuhara

et al. 2008

Hydrological Research Letters

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Abstract:The depth profile of 36 Cl/Cl ratio in groundwater was investigated in the Tsukuba Upland of central Japan. The obtained results clearly show the influence of bomb-produced 36 Cl; the highest 36 Cl/Cl ratio is about one order of magnitude greater than the natural background ratio (1 × 10 13 ). The vertical distribution of 36 Cl is consistent with previous observations using 3 H and Darcy's law. From the profile, the total bomb-produced 36 Cl fallout in the upland is 2.3 × 10 12 atoms/m 2 after the correction for surface runoff (c.f. 2.4 × 10 12 atoms/m 2 at the Dye-3 site, Greenland) and a scaling factor of 0.96 was obtained (c.f. 2.5 based on the simplified latitudinal fallout distribution model). We then reconstructed the local fallout history of 36 Cl based on the Dye-3 data (scaled with a factor of 0.96 for the Tsukuba Upland) and the mean 36 Cl flux, produced in the atmosphere from cosmic rays and measured 30 atoms m 2 s 1 in the upland. The ratio of the maximum bomb-peak fallout to the average natural background flux of meteoric 36 Cl is consistent with that of measured data in Nepal. The result implies that the simplified latitudinal distribution model for 36 Cl deposition is not easily applicable for the prediction of the bomb-produced 36 Cl fallout pattern.

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confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Estimate of Local Bomb-Produced 36Cl Fallout Using the Depth Profile of Groundwater in the Tsukuba Upland, Central Japan

Tosaki

Tase

Yasuhara

et al. 2008

Hydrological Research Letters

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“…The only mass spectrometric technique useful for determination of 36 Cl in low level environmental sample is AMS. The reported detection limit of AMS is 10 -9 Bq (or a 36 Cl/ 35 Cl ratio of 10 -15 ) [142][143][144]. In AMS, 36 Cl is normally prepared as AgCl target and the measurement is conducted using 36 Cl 7+ ions.…”

Section: Chlorine-36mentioning

confidence: 99%

“…The 36 S isobar is the principal challenge in AMS measurement of 36 Cl, because sulfur forms negative ions as readily as chlorine and the concentration of 36 S is normally much higher in the environmental samples compared to 36 Cl. By using an 48 MeV 36 Cl 7+ ion energy and a multi-anode ionization chamber as detector, 36 S can be highly suppressed by a factor of 10 4 [143]. In addition, chemical separation of sulfur from chlorine has to be used in the sample preparation, which is achieved by precipitation of sulfur as BaSO 4 .…”

Section: Chlorine-36mentioning

confidence: 99%