【摘要】 对核素在弱含水层中的三维迁移进行了现场试验。试验结果表明:经过1023d的试验,示踪核素90Sr、237Np、238Pu和241Am纵向分布的浓度峰均在最初释放的源层位置未动,迁移最快的90Sr的质心移动了0 32cm;按质心计算,90Sr、237Np、238Pu和241Am的延迟系数(Rd)分别为4 0×102、1 6×103、2 7×105和∞。这表明,黄土介质对这几种示踪核素具有强的吸附能力。更多还原

【Abstract】 A field tracer threedimension migration test in weak phreatic aquifer is conducted. It can be seen from the results of migration test of radionuclides that the peak positions of the radionuclides, 90Sr, 237Np, 238Pu and 241Am, don’t move, the mass center of 90Sr, which migrates at fastest velocity among them,only moves 0.32 cm during the 1 023 days, as well as the retardation coefficients, Rd, are 4.0×102 for 90Sr, 1.6×103 for237Np, 2.7×105 for 238Pu and ∞ for 241Am, respectively according to migration velocity of mass center. It shows that loess has stronger sorption capacity for the radionuclides.更多还原