| 摘要 |
PROBLEM TO BE SOLVED: To make a body having taken a radioactive material in itself safe in a living environment.SOLUTION: A method includes a heating/pressurizing/pressure releasing process selected out of a process of releasing pressure after heating a workpiece having taken a water liquid and a radioactive material in itself at a temperature equal to or lower than a critical temperature of the water liquid and in a pressure state of saturation vapor pressure or higher, a process placing the workpiece in a pressurized state and then abruptly releasing the pressure, a process of abruptly releasing pressure after heating the water liquid and workpiece at a temperature equal to or lower than the critical temperature of the water liquid and in a pressure state of saturation vapor pressure or higher; a separating process of separating a mixture of the workpiece and water liquid after the heating/pressuring/pressure releasing process into a liquid content and a solid content; and a condensing process of condensing the radioactive material by vaporizing the separated liquid content. |
