Rahman M M, Voigt G
Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Dhaka-1000, Bangladesh.
J Environ Radioact. 2004;71(2):127-38. doi: 10.1016/S0265-931X(03)00163-2.
In this work, soil-to-plant transfer factors of radiocaesium are predicted based on soil properties such as pH, organic matter content, exchangeable K+ and clay content valid for the tropical environments in Bangladesh, China and Japan, and using a previously published model. Due to insufficient data of soil properties in the selected regions, the average values of pH, organic matter content, exchangeable K+ and clay content were taken as the input model parameters within the ranges given for Asia. Nevertheless, a complete set of soil properties of Japanese soils was used to compare the measured and calculated TF values of radiocaesium for radish. The calculated TF values for radiocaesium are comparable with the measured values especially for leafy parts of a plant. However, calculated values for rice, an important crop in Asia are found to overestimate the measured values due to an overestimate of calculated CECs in soils in the selected regions. The empirical parameters used in the model need to be re-evaluated for the specific part of a plant and/or for a variety of different plants. Alternatively, a general conversion factor for each part of a plant and/or for a variety of different plants for a specific region is suggested for tropical environments.
在这项研究中，基于土壤性质（如pH值、有机质含量、交换性钾离子和粘土含量），利用先前发表的模型，预测了孟加拉国、中国和日本热带环境下放射性铯的土壤-植物转移因子。由于所选区域土壤性质数据不足，在亚洲给定范围内，将pH值、有机质含量、交换性钾离子和粘土含量的平均值作为输入模型参数。然而，使用了日本土壤的完整土壤性质数据集来比较萝卜中放射性铯的测量值和计算值。放射性铯的计算转移因子与测量值具有可比性，特别是对于植物的叶部。然而，由于所选区域土壤中计算得到的阳离子交换量被高估，亚洲重要作物水稻的计算值被发现高估了测量值。该模型中使用的经验参数需要针对植物的特定部分和/或各种不同植物重新评估。或者，针对热带环境，建议为特定区域的植物各部分和/或各种不同植物制定一个通用转换因子。
