| A | B |
|---|
| Alpha particle | a helium-4 nucleus |
| Alpha decay | the radioactive process in which an alpha particle is emitted |
| Artificial transmutation | to induce a nuclear reaction by bombarding a target nucleus with a nuclear particle |
| Beta-particle | an electron |
| Beta+particle | a positron |
| Fission | a nuclear reaction in which a heavy nuclide splits to form lighter nuclides and energy |
| Fusion | a nuclear process in which light nuclides join to form heavier nuclides and produce radiant energy |
| Gamma radiation | high-energy electromagnetic radiation with a high penetrating power |
| Half-life | the time it takes for a substance to decay to one-half its initial mass |
| Radioactivity | the spontaneous breakdown of a radioactive nuclide |
| Radioactive tracer | a radioisotope used to indicate the path of an atom in a chemical reaction |
| Radioisotope | a radioactive isotope |
| Transmutation | the conversion of one element to another by a nuclear process. |
