| A | B |
|---|
| Fission | The splitting of the nucleus of an atom into nuclei of lighter atoms, accompanied by the release of energy.,  |
| Alpha particle | A positively charged particle that is the nucleus of the helium atom,  |
| Band of stability | Chemical isotopes that are not radioactive |
| Beta particle | A high-speed electron or positron emitted in the decay of a radioactive isotope,  |
| Film badge | Small piece of x-ray or similar photographic film in a light-proof paper usually crossed by lead or cadmium strips, carried in a small metal or plastic frame,  |
| Fusion | The act or process of fusing; the state of being fused.,  |
| Gamma ray | Electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength,  |
| Geiger counter | Counter tube that detects ionizing radiations,  |
| Half-life | The time required for something to fall to half its initial value,  |
| Ionizing radiation | High-energy radiation capable of producing ionization in substances through which it passes,  |
| Neutron absorption | Kind of nuclear reaction in which an atomic nucleus collides with one or more neutrons and they merge to form a heavier nucleus |
| Neutron activation analysis | Nuclear process used for determining certain concentrations of elements in a vast amount of materials,  |
| Neutron moderation | A medium which reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235,  |
| Nuclear force | The force between two or more nucleons,  |
| Positron | An elementary particle with positive charge; interaction of a positron and an electron results in annihilation,  |
| Radiation | Any process in which energy travels through a medium or through space, ultimately to be absorbed by another body,  |
| Radioactivity | The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay,  |
| Radioisotopes | Radioactive isotope of an element; produced either naturally or artificially,  |
| Scintillation counter | Counter tube in which light flashes when exposed to ionizing radiation,  |
| Transmutation | An act that changes the form or character or substance of something,  |
| Transuranium elements | Are the chemical elements with atomic numbers greater than 92,  |
