McGee E J, Keatinge M J, Synnott H J, Colgan P A
Radiological Protection Institute of Ireland, Dublin.
Health Phys. 1995 Mar;68(3):320-7. doi: 10.1097/00004032-199503000-00003.
Sampling was carried out at an upland peat site in Ireland to assess the variability in 137Cs deposition to soils and activity concentration in individual vegetation species. A 3,600 m2 quadrat was laid out, and a soil core was extracted within each of sixteen 20 x 20 cm soil monoliths. The coefficient of variation values for 137Cs deposition and activity in individual soil horizons were in all cases greater than 30%, and the relative variability between corresponding horizons tended to increase with depth. Samples of Calluna vulgaris and Juncus squarrosus were taken at each soil sampling location and coefficients of variation for 137Cs activity in these species were 12 and 20%, respectively. The data was used to examine the relationship between the number of samples analyzed in a survey, the variability within those samples, and the way those two factors affect our ability to detect between-site differences in 137Cs contamination levels. A methodology is developed for detection of between-site differences in 137Cs contamination under different experimental criteria. The data show that, of the sample types examined, between-site differences could be detected most efficiently with C. vulgaris. Because of the variability associated with the 137Cs content of each sample type, between-site differences could be detected with fewer plant samples than soil samples. Plant-soil concentration ratios, transfer factors, and plant-plant ratios were calculated from the data, and the variability associated with each parameter was assessed. The variation among values for plant-plant ratios was less than among concentration ratios, and the greatest spread of values was associated with plant-soil transfer factors.
在爱尔兰的一个高地泥炭地进行了采样，以评估土壤中137Cs沉积的变异性以及各个植被物种中的活度浓度。布置了一个3600平方米的样方，并在16个20×20厘米的土壤单块中的每一个内提取了一个土壤岩芯。各个土壤层中137Cs沉积和活度的变异系数在所有情况下均大于30%，并且相应土层之间的相对变异性往往随深度增加。在每个土壤采样地点采集了普通石南和粗糙灯心草的样本，这些物种中137Cs活度的变异系数分别为12%和20%。这些数据用于研究调查中分析的样本数量、这些样本内的变异性以及这两个因素影响我们检测137Cs污染水平站点间差异能力的方式。开发了一种方法来检测不同实验标准下137Cs污染的站点间差异。数据表明，在所研究的样本类型中，使用普通石南能最有效地检测到站点间差异。由于与每种样本类型的137Cs含量相关的变异性，检测站点间差异所需的植物样本比土壤样本少。根据数据计算了植物 - 土壤浓度比、转移因子和植物 - 植物比，并评估了与每个参数相关的变异性。植物 - 植物比的值之间的变化小于浓度比之间的变化，并且值的最大分散与植物 - 土壤转移因子相关。
