METHOD FOR REDUCING THE CONTENT OF RADIOACTIVE MATERIAL IN AN OBJECT CONTAINING RADIOACTIVE MATERIAL TO A SAFE LEVEL ENVIRONMENT AND A DEVICE FOR ITS IMPLEMENTATION

摘要

1. A method of reducing the content of radioactive material in an object containing radioactive material to a level safe for the environment, characterized in that it contains: an object that is at least an object selected from the group consisting of an organism, sewage sludge, soils and ashes of waste incinerators; subjected to the stage of heating / pressurization / depressurization selected from the group consisting of the stage of heating the object in a state when the temperature is less than or equal to the critical temperature of water, water a soluble liquid or a mixture of water and a water-soluble liquid (hereinafter, “water, a water-soluble liquid or a mixture of water and a water-soluble liquid” is referred to as “water-containing liquid”), and the pressure is greater than or equal to the saturated vapor pressure of the water-containing liquid, wherein the object is immersed in the water-containing liquid so that the water-containing liquid covers the object or its amount is greater than the pressure relief, the stage of placing the object for pressure and a sharp pressure drop, and the object is immersed in the water-containing liquid so that the water-containing liquid covers the object or its amount more, and the stage of heating the water-containing liquid and the object in a state where the temperature is less than or equal to the critical temperature of the water-containing liquid, and the pressure is greater than or equal to the saturated vapor pressure of the water-containing liquid, and the object is immersed in the water-containing liquid so that water-containing liquid covers the object or its quantity is larger and the subsequent sudden release of pressure; the story of the separation of a mixture of an object and a water-containing liquid into a liquid fraction