Patent ID: 9704609
Date: 2017-07-11
CPC Classifications: G21F,H01J,H05H

Claim:
1. A volume reduction apparatus, comprising: a heatable stage that is disposed inside a vacuum vessel and formed to place thereon a resin to be treated which carries a radioactive substance; a CCP power source that supplies a voltage or an electric field by capacitive coupling to a space above the stage inside the vacuum vessel; an ICP power source that supplies power by inductive coupling to oxygen plasma induced in the space; a coil connected at least to the ICP power source; a supply mechanism configured to supply the resin to be treated to the stage while maintaining a depressurized state of the vacuum vessel; and a computer or a sequential control unit configured to control the CCP power source and the ICP power source, wherein the CCP power source and the ICP power source are provided separately from each other, and the computer or the sequential control unit is configured such that when a voltage or an electric field that ignites the oxygen plasma is to be supplied to the space, the voltage or electric field is simultaneously supplied from the CCP power source and the ICP power source, and thereafter, the voltage or electric field is supplied from the CCP power source also when the resin to be treated is additionally supplied to the stage by the supply mechanism, to prevent plasma extinction.