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首页> 外文期刊>Sylwan >Dynamika zmian skażeń promieniotwórczych izotopami cezu w wybranych elementach ekosystemów leśnych Karpat i Sudetów
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Dynamika zmian skażeń promieniotwórczych izotopami cezu w wybranych elementach ekosystemów leśnych Karpat i Sudetów

机译:喀尔巴阡山脉和Sudetes森林生态系统某些元素中铯同位素放射性污染变化的动态

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The collaboration between The Hugo Kollataj Academy of Agriculture, Department of Forest Ecology and The Henryk Niewodniczanski Institute of Nuclear Physics, Department of Nuclear Physical Chemistry started in 1987. The first common project was done in 1988, and it concerns the recognition of the radiocesium content in forest litter and humus samples as well as fern leaf (Athyrium sp. Roth.) and spruce needles (Picea abies [L.] Karst.). Samples were collected in 1987 in 19 experimental sites located in forest mountains of southern Poland. The highest ~(137)Cs contamination level equal to 16 kBq/kg dry mass were found in ferns from Beskid Slaski Mts. In present work samples of fern leaf, forest litter (O_L) and humus (A_h) layers, collected in 1993 at 24 sites (18 of them identical with previous locations) were analysed. The radiocesium isotopes: ~(134)Cs (T_(1/2) =2.06 a) and ~(137)Cs (T_(1/2) =30.14 a) measurements were done using low-background gamma-rays spectrometers with Ge(Li) or HPGe detectors. A large variation of radiocesium content in litter or humus samples is still observed. The ~(134)Cs activity is basicaly proportional to this of ~(137)Cs, but due to the half-life time different, more than 8 years after contamination, the activity of ~(134)Cs for some samples reached the limit of the detection (ca. 1 Bq/kg). The largest variation between samples of different location has been observed for ferns. The highest contamination level were equal to 13.4 kBq/kg (Snieznik), whereas the minimum value (Dukla) is below the detection limit. The variation of radiocesium humus to fern transfer has been established, what suggest the immobilisatin of cesium on given locations.
机译:雨果·科拉塔吉农业学院森林生态系与亨利·尼克·尼奥沃德尼山斯基核物理研究所,核物理化学系之间的合作始于1987年。第一个共同项目于1988年完成,涉及放射性铯含量的识别。包括森林凋落物和腐殖质样品,以及蕨叶(Athyrium sp。Roth。)和云杉针(Picea abies [L.] Karst。)。 1987年在位于波兰南部森林山区的19个实验点收集了样本。在Beskid Slaski Mts的蕨类植物中发现最高的〜(137)Cs污染水平等于16 kBq / kg干重。在目前的工作中,对1993年在24个地点(其中18个与以前的地点相同)收集的蕨叶,森林凋落物(O_L)和腐殖质(A_h)层进行了分析。放射性铯同位素:〜(134)Cs(T_(1/2)= 2.06 a)和〜(137)Cs(T_(1/2)= 30.14 a)测量是使用低背景伽马射线谱仪和Ge完成的(Li)或HPGe探测器。仍然观察到垃圾或腐殖质样品中的放射性铯含量变化很大。 〜(134)Cs的活度基本上与〜(137)Cs的活度成正比,但由于半衰期不同,在污染后超过8年,某些样品的〜(134)Cs活度达到极限检测量(约1 Bq / kg)。对于蕨类植物,在不同位置的样品之间观察到最大的变化。最高污染水平等于13.4 kBq / kg(Snieznik),而最小值(Dukla)低于检测极限。放射性腐殖质向蕨类植物转移的变化已经确定,这表明铯在给定位置上的固定化。

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