Radioactive fusion is created by the two elements deuterium and tritium fusing into energy and letting out an atom of helium. Tritium is not commonly found in natural form so scientists have to create artificial tritium. But Deuterium is very common in natural form so it is not needed to create artificial deuterium. Deuterium can even be found in water. 2 liters of water with 250 grams of rocks would power a whole European family's house for a whole year.