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A single electrode microwave based atmospheric pressure plasma jet (APPJ) hadbeen developed, characterized and applied for decontamination of Pu basedsynthetic radioactive waste. Argon plasma with small amount of CF4 and O2 wasused for this purpose. The device was initially characterized by opticalemission spectroscopy (OES) to determine its operational regime and used on Ta,a known surrogate of Pu for testing its efficacy in etching. Parametricoptimization studies had been conducted thereafter on solid radioactive wastesof Pu and it was seen that presence of oxygen in plasma plays a crucial role inefficient removal of contamination. A scaled up multi-electrode version of thisdevice was later designed and employed inside the glove box for similarstudies. It was seen that ~ 92% decontamination could be achieved underoptimized condition with both the devices and the scaled up APPJ device reducedoperation time by 50%.

Actinide Decontamination by Microwave Atmospheric Pressure Plasma jet: A Systematic Study Supported by Optical Emission Spectroscopy