| A | B |
|---|
| Half-life | the time taken for the radioactivity of a specified isotope to fall to half its original value |
| Photon | a particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass. |
| Alpha Decay | a radioactive process in which an alpha particle is emitted from the nucleus of an atom, decreasing its atomic number by two. |
| Fission | the action of dividing or splitting something into two or more parts. |
| Fusion | the process or result of joining two or more things together to form a single entity. |
| Beta Decay | radioactive decay in which an electron is emitted. |
| Gamma | the third position relative to a designated carbon atom in an organic molecule at which an atom or a group may be substituted. |
| Atom | the basic unit of a chemical element. |
| Radiation | the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization |
| Wave | a periodic disturbance of the particles of a substance that may be propagated without net movement of the particles, such as in the passage of undulating motion, heat, or sound. |
| Light particles | Photons |
