:Result and Its Considerations of the Basic Experiments

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Tritiated water is one of the radioactive wastes which are produced at atomic facilities. Tritiated water behaves as well as ordinary water and 'therefore' it is difficult to remove tritium from radioactive waste water alike other radioactive nuclides.We thought that it is an effective method to fix tritiated water using the hydration of cement.Generally, 3CaO·2SiO2·3H2O and Ca(OH)2 are mainly produced at the hydration of cement in which 25 weight percent water of cement is consumed. Therefore, making use of this action, it is expected that tritiated water would be fixed as the structure of these compositions in the hydrated cement.Although it is already found with simple experiments that most tritiated water transfers to surrounding water, yet it is incorporated using the hydration of portland cement. We tried, accordingly, to investigate the mechanism of the transfer phenomenon of the tritiated water fixed with cement.In this report, we showed the results and some considerations of basic experiments, concerning the effects of kind of cements, curing period, soaking period in water, presence of gel. water, and concentrations of salts and alkalis in surrounding water.
日本保健物理学会の論文