| A | B | 
|---|
| Radioactivity | The emission of high-energy radiation or paricles. | 
| Nuclide | The nucleus of an isotope with a certain atomic number and mass | 
| Alpha Particle | Given off when a nucleus releases two protons and two neutrons | 
| Beta Particle | When an elcetron is emitted from the nucleus at high speed | 
| Transmutation | The process of changing one element to another through nuclear decay | 
| Gamma Rays | Electro-magnetic waves with very high frequency and energy | 
| Half-life | The amount of time it takes for the nuclides in a sample of an isotope to decay | 
| Cloud Chamber | Device used to detect charged nuclear particles as they leave cloud tracks | 
| Bubble Chamber | Holds a super heated liquid which doen't boil because of increased pressure | 
| Nuclear Fission | Process of splitting a nulceus into two nuclei with smaller masses | 
| Chain Reaction | An ongoing series of fission reactionss | 
| Nuclear Fusion | The combining of two nuclei with low masses | 
| Tracer | Radiosotopes that are used inside of a body to monitor body processes | 
| P.E.T. | Position Emission Tomography |