^(90)Sr、^(237)Np、^(238)Pu和^(241)Am在含水层中迁移的模拟实验  

SIMULATION TEST OF ^(90)Sr, ^(237)Np, ^(238)Pu AND ^(241)Am MIGRATION IN AQUIFER

作　　者：郭择德[1] 李书绅[1] 邓安[1] 杨端节[1] 程金茹[1] 刘力[1] 

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《辐射防护》2003年第1期19-25,共7页Radiation Protection

摘　　要：在中国辐射防护研究院野外试验场的地下研究设施内进行了 90 Sr、2 3 7Np、2 3 8Pu和 2 41Am在含水层介质中迁移的模拟实验。实验用的非扰动原状土柱取自地下研究设施内的含水层 ,实验用水为地下水。实验结果表明 ,试验场含水层介质对 2 3 8Pu和 2 41Am具有很强的吸附能力 ,对 2 3 7Np的吸附能力相对次之 ,对 90 Sr的吸附能力相对较弱。在实际水流速为 6 .13cm/ d条件下 ,经过 5 2 7.5天 ,各核素的活度浓度峰分别迁移了 16 cm(90 Sr)、3.9cm(2 3 7Np)、小于 0 .2 cm(2 3 8Pu和 2 41Am)。采用核素二维迁移方程和本文提出的核素从源层释放的洗脱模型对浓度分布进行了拟合 ,得到了核素迁移参数 。A simulation test of radionuclide migration in aquifer has been performed in the Underground Research Facility at CIRP′s Field Test Site. 90 Sr, 237 Np, 238 Pu and 241 Am were selected as tracers for the test. An undisturbed soil column and the water used in the test were taken from the aquifer in the Facility. During the test hydrodynamic parameters were measured. After 527.5 day test, the soil column was cut along both longitudinal and radial directions for taking ring shaped samples, and samples were measured for obtaining the distribution of radionuclide concentration. Testing results were fitted with two dimensional radionuclide migration equation and a release model is proposed by the authors. Testing results evidences that aquifer medium in the Test Site has a strong adsorption ability to 238 Pu and 241 Am, medial ability to 237 Np, and relatively low to 90 Sr. Fitted results indicate that the proposed release model is suitable to analyzing the test data. (

关 键 词：锶90 镎237 钚238 镅241 核素迁移 模拟实验 含水层 安全评价 放射性废物 近地表处置 

分 类 号：TL942[核科学技术—辐射防护及环境保护]