Applicability study of X-ray computed tomography technique

Tanai, Kenji ; Matsumoto, Kazuhiro*; Kikuchi, Hirohito*

Several experiments on the study of high level radioactive waste disposal indirectly measured various physical quantity in the closed test vessel by various sensor. This measurement technique on closed-system cause limit of understanding of mechanisms. Therefore, new observation technique by nondestructive technique such as X-ray computed tomography is nessessary for HLW disposal study. In this work, the objective of this study are as follows; (1)to clarify the relationship between dry density of bentonite and CT number, (2)to observed infiltration behaviour of liquid in bentonite specimen using X-ray CT (3)to observed gas migration bihaviour in bentonite specimen using X-ray CT The major conclusions obtained in this study are as follows; (1)CT number of X-ray increases lineary with degree of saturation and density of bentonite specimen. (2)Infiltration behaviour of liquid in bentonite specimen can be observed by X-ray CT. (3)Gas permeability of benonite with a dry density of 1.6 Mg/m is approximately 6 10 m. And, this result was almost the same with the other experimental results. But, significant difference of breakthrough phenomena was observed between this test and other experiments results. In visiuarization study of gas migration through bentonite, gas migration behaviour through bentonite was not observed by X-ray CT.