Long-term trends in the uptake of radiocesium in Rozites caperatus
Long-term trends in the uptake of radiocesium in Rozites caperatus
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DOI：
10.1016/j.scitotenv.2004.01.022
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发表时间：
2004-07-05
影响因子：
9.8
通讯作者：
Strandberg, M
中科院分区：
文献类型：
--
作者：
Strandberg, M
从1991年到2001年，对Rozites caperatus中的Cs-134和Cs-137的测量显示，随着时间的推移，切尔诺贝利和沉降物产生的放射性铯的吸收模式存在差异。切尔诺贝利产生的铯-137的有效半衰期被确定为12.4年，而沉降物产生的铯-137的有效半衰期为9.8年。然而，切尔诺贝利衍生的Cs-137的趋势显然不是线性的。在1991年至1994年期间，切尔诺贝利核电站产生的铯-137的有效平均半衰期为3.1年。相应的生态半衰期为3.4年。在1994年至2001年期间，有效半衰期可能比物理半衰期长，这表明切尔诺贝利铯的可用量超过了通过放射性衰变消失的量。这种差异可能是由于放射性铯的深度分布，即放射性沉降物衍生的铯渗透到比切尔诺贝利更深的地方。切尔诺贝利放射性铯的半衰期随时间的变化，以及较老的沉降物放射性铯的半衰期，可能对预测蘑菇中放射性铯的未来浓度，从而预测转移到人类的食物链有价值。
Measurements of Cs-134 and Cs-137 in Rozites caperatus from 1991 to 2001 showed differences in the uptake pattern of Chernobyl and fallout derived radiocesium over time. The effective half-life of Chernobyl derived Cs-137 was determined to 12.4 years, whereas fallout derived Cs-137 had an effective half-life of 9.8 years. However, the trend for Chernobyl derived Cs-137 was clearly not linear. An effective average half-life of 3.1 years was determined for Chernobyl derived Cs-137 in the period from 1991 to 1994. The corresponding ecological half-life was 3.4 years. In the period from 1994 to 2001 it is possible that the effective half-life was longer than the physical, which indicates that more Chernobyl cesium becomes available than disappears through radioactive decay. The difference may be due to depth distribution of radiocesium, i.e. fallout derived cesium have penetrated deeper than Chernobyl. The changes in the half-lives of Chernobyl derived radiocesium over time together with the half-life of the older fallout derived radiocesium may be valuable in predictions of future radiocesium concentrations in mushrooms and thereby of food chain transfer to man. (C) 2004 Elsevier B.V. All rights reserved.