Mishra S, Maity S, Pandit G G
Environmental Assessment Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
Radiat Prot Dosimetry. 2012 Nov;152(1-3):229-33. doi: 10.1093/rpd/ncs227. Epub 2012 Aug 26.
The distribution coefficient, K(d) in soil is an important parameter to predict the migration of contaminants. In this study, uranium (U) and its decay products thorium (Th), radium (Ra), bismuth (Bi), lead (Pb) and polonium (Po), which may contaminate the soil and ground water around uranium mining areas, have been considered. Soil and ground water samples were collected from a proposed uranium mining site in India. The soil samples were characterised for different parameters affecting the K(d) values. The batch sorption method was employed to measure the K(d) of different radionuclides. The important factors affecting the batch method for K(d) estimation were identified and optimised. The variation of K(d) was observed with different ionic strength water samples. Results showed high K(d) values for Th(IV), Po(IV) and Pb(II) (log K(d) ∼4) and low K(d) (log K(d) ∼2-3) for U(VI), Ra(II) and Bi(III) in all three types of water with different ionic strength.
土壤中的分配系数K(d)是预测污染物迁移的一个重要参数。在本研究中，考虑了可能污染铀矿区周围土壤和地下水的铀（U）及其衰变产物钍（Th）、镭（Ra）、铋（Bi）、铅（Pb）和钋（Po）。从印度一个拟建的铀矿开采场地采集了土壤和地下水样本。对影响K(d)值的不同参数对土壤样本进行了表征。采用批量吸附法测量不同放射性核素的K(d)。确定并优化了影响K(d)估算批量法的重要因素。观察了不同离子强度水样中K(d)的变化。结果表明，在所有三种不同离子强度的水中，Th(IV)、Po(IV)和Pb(II)的K(d)值较高（log K(d) ∼4），而U(VI)、Ra(II)和Bi(III)的K(d)值较低（log K(d) ∼2-3）。
