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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Plutonium isotope ratios in the Yenisey and Ob estuaries.
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Plutonium isotope ratios in the Yenisey and Ob estuaries.

机译：Yenisey和Ob口的同位素比率。

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摘要

Over the past 50 years, nuclear weapons' tests and releases from the nuclear industry have introduced anthropogenic plutonium into the environment. In the Arctic environment, the main source of plutonium is from the atmospheric weapons testing, but previous studies of plutonium in the Kara Sea have shown that, at certain sites, other releases can give rise to enhanced local concentrations. The present paper presents results from determination of plutonium concentrations and isotope ratios in the sediment samples collected during various expeditions to the Kara Sea, the Ob and Yenisey estuaries and their river systems. The data indicated a clear influence from a low (240)Pu:(239)Pu source in surface sediments collected from the Yenisey estuary, whereas plutonium in Ob estuary sediments is dominated by global fallout. The results also show an increase in plutonium concentration (from 0.003 to 11Bq/kg) and a decrease in (240)Pu:(239)Pu isotope ratio (from 0.16 to 0.05) going upstream from the Yenisey estuary towards the nuclear installation at Krashnoyarsk.
机译：在过去的50年中，核武器的试验和核工业的释放已将人为p引入环境。在北极环境中，the的主要来源来自大气武器测试，但先前在卡拉海进行的studies研究表明，在某些地点，其他释放会导致局部浓度增加。本文介绍了在对卡拉海，鄂毕河和耶尼西河口及其河流系统进行的各种考察中所收集的沉积物样品中of的浓度和同位素比的测定结果。数据表明，从耶尼西河口收集的表层沉积物中低（240）Pu：（239）Pu来源显然具有影响，而Ob口沉积物中的p主要受全球沉降影响。结果还显示，从叶尼西河口上游向Krashnoyarsk核设施的going浓度增加（从0.003到11Bq / kg），并且（240）Pu：（239）Pu同位素比降低（从0.16到0.05）。 。

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