Gesellschaft für Strahlen- und Umweltforschung München, Institut für Strahlenschutz, D-8042, Neuherberg, FRG.
Environ Monit Assess. 1987 Jan;8(1):93-101. doi: 10.1007/BF00396609.
To obtain information on the spatial variability of fallout (137)Cs in the soil of a small area, the activity concentration of this radionuclide was determined in 100 soil samples, taken along the two diagonals of a cultivated field (150×100 m). The results show that the spatial distribution of (137)Cs in this field is at random. The frequency distribution of the values is skewed to the right, but not log-normal. The median activity concentration observed was 7.45 Bq kg(-1) dry soil, the values ranging from 4.8-15 Bq kg(-1). The spatial variability, as characterized by the relative decile deviation was 26%. If one tolerates for the establishment of baselines of global fallout (137)Cs in the soil an error in the mean activity concentration of 10% (20%) at the 95% confidence level, the minimum number of soil samples to be taken can be estimated as 14 (4). The total deposition of (137)Cs on the soil surface by fallout was determined as 3.3±0.4 kBq m(-2).
为了获取小面积土壤中沉降物(137)Cs 空间变异性的信息，在一块耕种农田（150×100 m）的两条对角线上采集了 100 个土壤样本，以确定该放射性核素的活度浓度。结果表明，该农田中(137)Cs 的空间分布是随机的。该值的频率分布向右偏态，但不是对数正态分布。观察到的中值活度浓度为 7.45 Bq kg(-1)干土，取值范围为 4.8-15 Bq kg(-1)。相对十分位偏差特征的空间变异性为 26%。如果为建立全球沉降物(137)Cs 在土壤中的基准值，在 95%置信水平下允许活度浓度均值存在 10%（20%）的误差，则可以估计需要采集的土壤样本最小数量为 14（4）。通过沉降作用在土壤表面沉积的(137)Cs 总量为 3.3±0.4 kBq m(-2)。
