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首页> 外文期刊>The Science of the Total Environment >Retrospective determination of ~(137)Cs specific activity distribution in spruce bark and bark aggregated transfer factor in forests on the scale of the Czech Republic ten years after the Chernobyl accident
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Retrospective determination of ~(137)Cs specific activity distribution in spruce bark and bark aggregated transfer factor in forests on the scale of the Czech Republic ten years after the Chernobyl accident

机译：切尔诺贝利事故十年后捷克共和国范围内的云杉树皮和森林中树皮总迁移因子的〜（137）Cs比活度分布的回顾性测定

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The ~(137)Cs specific activities (mean 32Bqkg ') were determined in spruce bark samples that had been collected at 192 sampling plots throughout the Czech Republic in 1995. and were related to the sampling year. The ~(137)Cs specific activities in spruce bark correlated significantly with the ~(137)Cs depositions in areas affected by different precipitation sums operating at the time of the Chernobyl fallout in 1986. The ratio of the ~(137)Cs specific activities in bark and of the ~(137)Cs deposition levels yielded bark aggregated transfer factor T_(ag) about 10.5 x 10"3 m~2 kg"1. Taking into account the residual specific activities of ~(137)Cs in bark 20 Bq kg"1 and the available pre-Chernobyl data on the ~(137)Cs deposition loads on the soil surface in the Czech Republic, the real aggregated transfer factor after and before the Chernobyl fallout proved to be T_(ag)~-= 3.3 x×10~3 m~2 kg~' and TJ|=4.0x 10~3 m~2 kg"1, respectively. The aggregated transfer factors TJg for ~(137)Cs and spruce bark did not differ significantly in areas unequally affected by the ~(137)Cs fallout in the Czech Republic in 1986, and the figures for these aggregated transfer factors were very similar to the mean bark T_(ag) values published from the extensively affected areas near Chernobyl. The magnitude of the ~(137)Cs aggregated transfer factors for spruce bark for the pre-Chernobyl and post-Chernobyl period in the Czech Republic was also very similar. The variability in spruce bark acidity caused by the operation of local anthropogenic air pollution sources did not significantly influence the accumulation and retention of ~(137)Cs in spruce bark. Increasing elevation of the bark sampling plots had a significant effect on raising the remaining ~(137)Cs specific activities in bark in areas affected by precipitation at the time when the plumes crossed, because the sums of this precipitation increased with elevation (covariable).
机译：1995年在捷克共和国的192个采样点采集的云杉皮样品中确定了〜（137）Cs的比活（平均32Bqkg'）。云杉树皮中〜（137）Cs比活度与1986年切尔诺贝利坠落时受不同降水总量影响的地区的〜（137）Cs比活度显着相关。〜（137）Cs比活度之比在树皮中，每千立方英尺和约（137）Cs的沉积水平产生约10.5 x 10“ 3 m〜2 kg” 1的树皮聚集转移因子T_（ag）。考虑到树皮20 Bq kg“ 1中〜（137）Cs的残留比活以及捷克共和国土壤表面〜（137）Cs沉积负荷的可用切尔诺贝利前数据，即实际的总转移因子切尔诺贝利坠落之后和之前分别被证明是T_（ag）〜-= 3.3 x×10〜3 m〜2 kg〜'和TJ | = 4.0x 10〜3 m〜2 kg'-1。 〜（137）Cs和云杉树皮的总转移因子TJg在1986年捷克共和国受〜（137）Cs沉降影响不均的地区没有显着差异，这些总转移因子的数字与从切尔诺贝利附近受到广泛影响的地区公布的平均树皮T_（ag）值。在捷克共和国切尔诺贝利之前和切尔诺贝利之后的时期，云杉皮的〜（137）Cs聚集转移因子的大小也非常相似。云杉皮酸度的变化是由当地人为空气污染源的运行引起的，并没有显着影响云杉皮中〜（137）Cs的积累和保留。树皮采样区海拔的升高对提高羽流穿越时受降水影响的地区树皮中剩余的〜（137）Cs比活度具有显着影响，因为该降水的总和随海拔的升高而增加（可变量）​​。

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