摘要
在大气和低氧条件下使用静态背对背扩散法测定了237Np在红泉膨润土中表观扩散系数Da值。实验结果如下:大气条件下237Np在混合型、Ca 型、Mg 型膨润土中的Da值分别为3 9×10-13,5 6×10-13,8 4×10-13m2/s;低氧条件下相应的Da值分别为3 4×10-13,4 7×10-13,3 1×10-13m2/s。在大气条件下以混合型膨润土为例,使用扩散池方法测得237Np的表观扩散系数Da值为8 2×10-12m2/s。
The research is to determine diffusion coefficients of))~237)Np in three kinds of bentonite under atmosphere and anoxic atmosphere by back-to-back method. Da values determined by back-to-back way as follows:the mixed bentonite is 3.9×10^-13) m^2/s, Mg-bentonite 8.4×10^-13) m^2/s,Ca-bentonite 5.6×10^-13)m^2/s,respectively;and corresponding Da values under anoxic atmosphere:3.4×10^-13) m^2/s,3.1×10^-13) m^2/s and 4.7×10^-13) m^2/s. On the other hand,the Da value of))~237)Np on mixed bentonite is determined by flow experiment,and the result is Da=8.2×10^-12) m^2/s.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2003年第4期199-203,共5页
Journal of Nuclear and Radiochemistry
