radioisotope
Isotope of an atom that spontaneously emits one or more types of radioactivity (alpha particles, beta particles, gamma rays).
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Chapter 3 - Science, Systems, Matter & Energy
radioactivity
Nuclear change in which unstable nuclei of atoms spontaneously shoot out "chunks" of mass, energy, or both at a fixed rate. The three principal types of radioactivity are gamma rays and fast-moving alpha particles and beta particles.
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radioactive isotope
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radioactive decay
Change of a radioisotope to a different isotope by the emission of radioactivity.
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radiation
Fast-moving particles (particulate radiation) or waves of energy (electromagnetic radiation). See alpha particle, beta particle, gamma rays.
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proton (p)
Positively charged particle in the nuclei of all atoms. Each proton has a relative mass of 1 and a single positive charge. Compare electron, neutron.
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precision
Measure of reproducibility, or how closely a series of measurements of the same quantity agree with one another. Compare accuracy.
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potential energy
Energy stored in an object because of its position or the position of its parts. Compare kinetic energy.
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positive feedback loop
Situation in which a change in a certain direction provides information that causes a system to change further in the same direction. Compare negative feedback loop.
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plasma
An ionized gas consisting of electrically conductive ions and electrons. It is known as a fourth state of matter.
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