nuclear changes

4. the force that makes it possible for neutrons and protons to exist together in the nucleus of atoms.
7. positively charged and more massive than any other type of nuclear radiation.
10. is a treatment that uses controlled doses of nuclear radiation for treating diseases such as cancer.
11. the quantity of ionizing radiation that does as much damage to human tissue as one Rontgen of high voltage x-ray does.
13. an electron or positron that is emitted from a nucleus during radioactive decay.
14. the minimum mass of a fissionable isotope that provides the number of neutrons needed to sustain a chain reaction.
15. the nuclear radiation that arises naturally from cosmic ray sand from radioactive isotopes in the soil.

1. the process in which light nuclei combine at extremely high temperatures forming heavier nuclei and releasing energy.
2. the high energy photon emitted by a nucleus during fission and radioactive decay.
3. is a radioactive material that are added to a substance so that its distribution can be detected later.
5. the released energy, and matter are collectively called nuclear radiation.
6. the process by which a nucleus splits into two or more fragments and releases neutrons and energy.
8. the unstable nuclei of these isotopes emit particles or release energy to become stable isotopes.
9. the time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope.
12. a continuous series of nuclear fission reactions.