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actinic of or pertaining to the chemical property of ultraviolet radiation and x-rays that produces photochemical effects.
actinic rays electromagnetic radiation, such as x-rays or ultraviolet light, that can produce an image on a photographic emulsion.
actinism the property of radiation that produces chemical activity.
alpha particle a positively charged particle given off as radiation from some fission or decay processes, consisting of two protons and two neutrons.
alpha ray radiation composed of alpha particles.
angle of incidence the angle that the line of movement of a body or of radiation, meeting a surface, makes with a line that is at right angles to the surface at the point of meeting.
anthracene a crystalline hydrocarbon derived from coal tar and used in making dyes and detecting radiation.
atomic clock an extremely accurate timekeeping device regulated by the reliably constant frequency at which atoms of certain highly reactive substances absorb or emit electromagnetic radiation.
black light ultraviolet or infrared radiation that is invisible but indirectly detectable, as by fluorescence.
bombard to shoot radiation or high energy particles at. [1/4 definitions]
bremsstrahlung electromagnetic radiation, such as x-rays, produced by the sudden deceleration or acceleration of an electron caused by its approach to an atomic nucleus.
collimator a device that transmits a beam of radiation, esp. light, as parallel rays. [1/2 definitions]
cosmic ray high energy radiation, consisting primarily of high-energy protons and alpha particles, that primarily originates from outside the solar system. Upon collision with earth's atmosphere, secondary particles can be produced that sometimes reach the earth's surface.
decontaminate to make (an area) safe for humans by removing or neutralizing radiation, poisonous substances, or the like. [1/2 definitions]
delta ray any particle emitted from matter following bombardment by ionizing radiation.
detector a device that records or identifies something, esp. changes in radiation, temperature, pressure, or the like. [1/2 definitions]
diffusion a spreading of light rays or other radiation by reflection from or by passing through an irregular surface. [1/3 definitions]
dose the amount of radiation or other toxic entity administered to or absorbed by a living organism. [1/6 definitions]
dosimeter a portable instrument that measures amounts of radiation, such as gamma rays or x-rays, to which a person has been exposed.
expose to subject (living beings) to the action of some substance or agent, such as radiation. [1/7 definitions]
fluor any compound that fluoresces when exposed to radiation, often added to experimental samples as a radiation indicator. [1/2 definitions]