循环柱实验装置的建立及其在核素迁移实验研究中的应用

本文介绍循环柱实验装置的特点以及在核素迁移实验研究中的应用。该装置是将实验介质如石英砂或黄土填充在有机玻璃柱中，联接所有管路接头并密封，即可进行实验。采用该装置进行实验时，淋洗液在柱中多次循环，直到循环流出液的放射性浓度基本不变，它具有静态和动态实验的特性。经实验验证，所建立的循环柱实验装置设计配置合理、运行稳定、操作方便。采用不同介质分别与^237Np和^238Pu在循环水作用下，进行了核素迁移实验。结果表明：循环柱实验结果与静态实验结果有明显的相对可比性（即相关性），它可替代静态法和动态法，用来测定吸附分配比、分析核素在介质中的迁移分布状况。所得结果更接近现场实验结果。

DEVELOPMENT OF A WATER CIRCULATING COLUMN SYSTEM AND ITS APPLICATION TO NUCLIDE MIGRATION TEST

Using a online micro pump, a close system with circulating water through a Perspex column, filled with media of quartz or loess, was set up. While spiked solution injected and time span provided, circulation would result in an almost constant concentration of radionuclide in the effluent. Characteristics for conventional batch and flow through tests are both manifested in it. For the tests with 237 Np, 238 Pu involved, the results are comparable to those provided by batch method, moreover, close to those from field tests. It suggests that circulating column technique can be adopted to determine distribution coefficient, and understand migration behavior of radionuclide in interested medium. Design, operation and control of the system were verified simultaneously. (