He-3 He-3 2 protons 2 protons 1 neutron 1 neutron a. gamma decay b. beta-positive decay c. alpha decay d. beta-negative decay two marks) Which statement about nuclear fusion is true? a. Nuclear fusion reactions produce significantly less energy per mass of fuel than fission reactions. b. Controlled nuclear fusion has been achieved, but not in a sustainable way. c. Nuclear fusion reactions are endothermic. d. Nuclear fusion is the process by which the nucleus of an atom is split into smaller pieces. 10. (two marks) Which of the following is a medical use for radioisotopes? . creating super human abilities b. medical imaging devices that detect the radiation so doctors can compare unhealthy and healthy organs c. providing pain relief to suffering patients d. detecting bone fractures