Decontamination Process by High Density Active Atoms in An Atmosheric-Pressure Plasma

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A special feature of our microwave heated plasma generator has been shown as a source of high concentration reactive atoms in the discharge of molecular gases. The mixed feed gas which is consists of CF_4 arid O_2 and flow rates was used for decontamibnation experiments, considering the stability of microwave discharge and the efficiency of radical generation into account And also the input power of microwave about 1.5 kW was chosen. As the substance which is decontaminated cobbalt oxide was used. Some drops of the solution of cobalt nitride with known concentration was dropped on a sample stainless steal plate (SUS304). After the weight drops was measured precisely, the plate was heated up to 500 。C and maintained at the same temp earature during 1 hour. Thus the black colored spot of cobalt oxide stained on the plate. For the measurements of cobalt ICP was used after dissolved into HCl solution. As a result, cobalt can be removed from the surface almost -100% at 250 seconds of decontamination time. Obtained decontamination efficiency is higher than reference value in the cobalt decontamination experiments which was carried out in low pressure. Also thermody namic modelling calculation was carried out for other elements, namely, Lanthanide (La, Gd) and Actinide (U,Pu) and the possibility of this application was described. From these results it was concluded that the method which we suggested is very powerful and has a large potential for practical use.