Evidence of Tc-99 in Ural river sediments

被引：26

作者：

Aarkrog, A

Chen, Q

Dahlgaard, H

Nielsen, SP

Trapeznikov, A

Pozolotina, V

机构：

[1] Risø National Laboratory

[2] Inst. of Plant and Animal Ecology, Ekaterinburg

来源：

JOURNAL OF ENVIRONMENTAL RADIOACTIVITY | 1997年 / 37卷 / 02期

关键词：

D O I：

10.1016/S0265-931X(96)00096-3

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Sediments collected from the Techa River at Nadirov Bridge were analysed for Tc-99. The maximum concentration was found at a depth of 14-18 cm. This layer was sedimented around 1950, i.e. at a time when the maximum releases of waterborne radionuclides occurred to the river from the MAYAK plutonium production plant in the Urals. The vertical distribution of Tc-99 in sediments followed that of Cs-137, and the mean ratio between Tc-99 and Cs-137 in the sediments at the time of discharge was 0.41 x 10(-3). Laboratory experiments showed that Tc-99 under anoxic conditions, e.g. when organic material is decomposing, will be retained br sediments. (C) 1997 Elsevier Science Ltd.

引用

页码：201 / 213

页数：13

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