Distribution of 36Cl/Cl in a river-recharged aquifer: Implications for the fallout rate of bomb-produced 36Cl

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:268

Article; Proceedings Paper

Tosaki, Yuki¹  Massmann, Gudrun²  Tase, Norio¹  Sasa, Kimikazu³  Takahashi, Tsutomu³  Matsushi, Yuki⁴  Tamari, Michiko⁵  Nagashima, Yasuo³  Bessho, Kotaro⁶  Matsumura, Hiroshi⁶ 

[1] Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan

[2] Free Univ Berlin, Dept Earth Sci, Inst Geol Sci, D-12249 Berlin, Germany

[3] Univ Tsukuba, Ctr Sci & Technol, Res Facil, Tsukuba, Ibaraki 3058577, Japan

[4] Univ Tokyo, Sch Engn, Dept Nucl Engn & Management, Bunkyo Ku, Tokyo 1130032, Japan

[5] Univ Tsukuba, Grad Sch Pure & Appl Sci, Dept Chem, Tsukuba, Ibaraki 3058571, Japan

[6] High Energy Accelerator Res Org, Radiat Sci Ctr, Tsukuba, Ibaraki 3050801, Japan

关键词: Bomb-produced Cl-36;    Groundwater;    Residence time;    Environmental tracer;    Accelerator mass spectrometry (AMS);   

DOI  :  10.1016/j.nimb.2009.10.148

来源: Elsevier

【 摘 要 】

Distribution of Cl-36/Cl ratios in a river-recharged aquifer was investigated in the Oderbruch area, northeastern Germany. The aquifer is confined up to 3.5-4 km inland, where it changes to an unconfined condition. The Cl-36/Cl ratios in the confined area were in the range between 4.6 x 10(-14) and 23.1 x 10(-14), showing a peak at 2-3 km away from the river. A plot of Cl-36/Cl vs. reciprocal Cl- concentrations indicated possible effect of the Cl- concentration variation on the observed Cl-36/Cl ratios. After accounting for this effect, the estimated Cl-36 fallout rates for the last 30 yrs show reasonable agreement with the Dye-3 data and the mid-latitude background value. The results suggest that a local Cl-36 fallout curve can be constructed from groundwater when dispersive mixing is of minor importance. (C) 2009 Elsevier B.V. All rights reserved.

【 授权许可】

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