Studies on the Container for Disposing Radioactive Wastes into the Sea-VI:On the Permeability and Diffusion in Mortar (2)

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This investigation belongs to series of the studies on the above title and is a serial report of the experimental research on the diffusion of solute in mortar samples. In case, where the concrete containers are deposited on the deep-sea floor over a long period, it is feared that the water-soluble radioactive wastes may leak out through the pores of concrete container by action of the molecular diffusion, and contaminate the surrounding sea water. In order to investigate this problem, studies were carried out on the diffusion in mortar wall and diffusion coefficients were determined. The result of radioactive iodide ion I-131 coincided nearly with that of chloride ion in the previous report, and between diffusion coefficient (D) and Coefficient of permeability (P) of I-131 it was observed that D is proportional to P0.5 in the same manner as in case of chloride ion. This proportional relationship was discussed in view of physics. Regarding radioactive zinc, Zn-65, on the other hand, we could not catch an evidence of the diffusion in mortar samples, although diffusion tests were carried out in very porous mortar samples for a long period. These phenomena may be effectively attributed to the colloidallization of Zn-65 ion in mortar. The experiments forcing ZnCl2 solution into mortar pores were consequently carried out and it was observed that Zn (OH)2 colloid had a function choking up pores of mortar samples.
日本海洋学会の論文