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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Cosmogenic radionuclide Na-22 in the Lake Biwa system (Japan): residence time, transport and application to the hydrology
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Cosmogenic radionuclide Na-22 in the Lake Biwa system (Japan): residence time, transport and application to the hydrology

机译：琵琶湖系统中的宇宙成因放射性核素Na-22（日本）：停留时间，运输及其在水文学中的应用

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摘要

Application of cosmogenic radionuclide Na-22 to limnological research was first successfully performed in the Lake Biwa system, Japan. The Na-22 was determined from large water samples of more than 500 L by using the ultra low-background Ge-detector installed at underground (Ogoya Lab.) after simple chemical separation. Extremely low Na-22 concentrations ranging from 19.9 to 32.7 mBq/m(3) and from 27.4 to 38.3 mBq/m(3) were found in the lake and river water samples, respectively. Mass balances of Na-22 from the watershed to river and lake were constructed by considering the atmospheric deposition of Na-22. The mean residence times of Na-22 in the southern and northern basins of Lake Biwa were estimated as about 18 days and 5.4 years, respectively. Furthermore, the mean residence time of this atmospheric nuclide in the watershed was evaluated as about 7.3 years, whose value may be helpful in tracing the fate of contaminants with similar chemical properties in the watershed. The quantity of groundwater flow into the lake was also roughly estimated to be 1.6 x 10(9) m(3)/yr from the specific activity of Na-22/Na. (c) 2005 Elsevier B.V. All rights reserved.
机译：在日本琵琶湖系统中首次成功地将宇宙成因放射性核素Na-22应用于岩性学研究。通过简单的化学分离，通过使用安装在地下（Ogoya Lab。）的超低背景Ge探测器，从500升以上的大型水样中测定Na-22。分别在湖泊和河流水样中发现Na-22的极低浓度范围分别为19.9至32.7 mBq / m（3）和27.4至38.3 mBq / m（3）。考虑到Na-22的大气沉积，构造了从分水岭到河流和湖泊的Na-22的质量平衡。 Na-22在琵琶湖南部和北部盆地的平均停留时间分别约为18天和5.4年。此外，估计该大气核素在流域中的平均停留时间约为7.3年，其值可能有助于追踪流域中具有相似化学性质的污染物的去向。从Na-22 / Na的比活度来看，流入湖泊的地下水量也粗略估计为1.6 x 10（9）m（3）/年。 （c）2005 Elsevier B.V.保留所有权利。

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