The method according to the present invention comprises using a high-frequency vibrating stirrer that is configured to include a treatment tank 1, a high-frequency vibrating motor 3 fixed to a table positioned above the treatment tank 1, two vibrating rods 4 extending toward the bottom of the treatment tank 1 and coupled to the table, and multistage vibrating blades 5 mounted to the lower parts of the vibrating rods 4 and surface-plated with palladium or platinum serving as a catalyst in element transmutation, characterized in that the high-frequency vibrating motor 3 is controlled by an inverter 6 so as to vibrate the multistage vibrating blades 5 at a frequency of 100-170 Hz in an aqueous solution 2 containing an element to be transmuted in the treatment tank 1, thereby transmuting the element in the aqueous solution 2 into another element. By adding heavy water to the solution to be treated, the transmutation efficiency can be elevated. By adding tritium water with an appropriate concentration as a substitute for the heavy water, the element transmutation can be completed within a short period of time and, at the same time, the tritium water that is seemingly the main cause of radioactive contamination can be effectively utilized and the radioactivity thereof can be attenuated or detoxified.

A nuclide transmutation device and a nuclide transmutation method which enable nuclide transmutation to be performed in a relatively small-scale device compared with large-scale devices such as accelerators and nuclear reactors, wherein the amount of nuclide transmutation can be increased. The nuclide transmutation device comprises a structure (1), and a high deuterium concentration unit (2) and a low deuterium concentration unit (2) disposed on either side of the structure (1) so as to sandwich the structure (1) therebetween, wherein an electrolytic solution (16) containing heavy water is supplied to the high deuterium concentration unit (2), the electrolytic solution (16) is electrolyzed to generate deuterium, thereby producing a state of high deuterium concentration near the high deuterium concentration unit (2) side surface of the structure (1) and placing the low deuterium concentration unit (3) in a state of low deuterium concentration relative to the high deuterium concentration unit (2), causing the deuterium to deuterium to penetrate through the structure (1) from the high deuterium concentration unit (2) toward the low deuterium concentration unit (3), and subjecting a substance to undergo nuclide transmutation to nuclide transmutation in the structure (1) by reaction with the deuterium.

Nuclear transformation method and apparatus can produce thermal energy and hydrogen with a simple structure. A reaction cell 1, 100, made of metal material like iron, from which oxygen is discharged is heated by a heater 6,115 at a temperature above 500°C. Water is supplied into the reaction cell 1,100 to be changed into steam which reacts on the inner wall of the reaction cell 1,100 to produce hydrogen and thermal energy through a nuclear transformation. In the case that a reaction agent (NaOH, K₂TiO₃) which includes at least alkaline metal and oxygen is accommodated in the reaction cell 1,100, a nuclear reaction occurs without the supply of water. Steam may be supplied into the reaction cell 1, 100 to activate the nuclear reaction and fins t 124 as a metal element supplying body may be accommodated in the reaction cell 1,100 to increase the area of the metal surface.