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首页> 外文期刊>Environmental Science & Technology >First derivation of predicted-no-effect values for freshwater and terrestrial ecosystems exposed to radioactive substances
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First derivation of predicted-no-effect values for freshwater and terrestrial ecosystems exposed to radioactive substances

机译：首次推论暴露于放射性物质的淡水和陆地生态系统的预测无影响值

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摘要

The FASSET Radiation Effects Database (FRED) constitutes a unique structured resource of the biological effects of ionizing radiation on non-human species mainly from temperate ecosystems, encompassing 26,000 primary data entries. Quality-assessed data were extracted from FRED and dose-effect relationships were constructed to provide estimates of ED50 and EDR10. These estimates are Doses (or Dose Rates) related to the percent change in the average level of the endpoint for a particular effect (50% or 10% for acute or chronic exposure regimes, respectively). Acute and chronic Species Sensitivity Distributions (SSDs) were built on the basis of these data sets, and the Assessment Factor Method (AFM) was applied when data were too scarce. The Hazardous Dose corresponding to 5% of species acutely affected at the 50% effect level varied from 1 to 5.5 Gy according to the ecosystem. For chronic gamma external irradiation exposure, no-effect values varied from 10 mu Gy/h for freshwaters through application of the AFM to 67 mu Gy/h for terrestrial ecosystems, corresponding to the 5th percentile of the non-weighted SSD (vs 229 mu Gy/h when trophic weights are applied). These values are higher by ca. x 50 to x 100 than the upper bound of natural background, and lower than dose rates
机译：FASSET辐射效应数据库（FRED）构成了一个独特的结构化资源，主要涉及来自温带生态系统的电离辐射对非人类物种的生物效应，涵盖26,000个主要数据条目。从FRED中提取质量评估数据，并建立剂量效应关系以提供ED50和EDR10的估计值。这些估计值是剂量（或剂量率），与特定效应终点平均水平的变化百分比有关（对于急性或慢性暴露方案，分别为50％或10％）。在这些数据集的基础上建立了急性和慢性物种敏感性分布（SSD），并且在数据太稀缺时应用了评估因子方法（AFM）。根据生态系统的不同，在50％的影响水平下，对应于5％的物种的急性危害量从1到5.5 Gy不等。对于慢性伽玛外部照射，无效应值从通过应用AFM的淡水为10亩Gy / h到陆地生态系统的67亩Gy / h不等，相当于未加权SSD的第5个百分位数（vs 229亩）施加营养重量时的Gy / h）。这些值约高。比自然背景的上限高50到100倍，且低于剂量率

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