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metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation A , angstrom , angstrom unit
(physics) material in a nuclear reactor that absorbs radiation absorber
measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber absorptance , absorption coefficient , coefficient of absorption
(physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body absorption factor , absorptivity
spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths absorption spectrum
electromagnetic radiation that can produce photochemical reactions actinic radiation , actinic ray
property of radiation that enables it to produce photochemical effects actinism
instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) actinometer
measuring the intensity of electromagnetic radiation (especially of the sun's rays) actinometry
efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation action spectrum
acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes agranulocytosis , agranulosis , granulocytopenia
Russian physicist whose research into ways of moving electrons around atoms led to the development of masers and lasers for producing high-intensity radiation (1916-2002) Aleksandr Mikjailovich Prokhorov , Aleksandr Prokhorov , Prokhorov
radiation of alpha particles during radioactive decay alpha radiation , alpha ray
agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease antimicrobial , antimicrobic , disinfectant , germicide
any telescope designed to collect and record electromagnetic radiation from cosmic sources astronomical telescope
satellite equipped with a telescope to observe infrared radiation astronomy satellite
(physics) a spectrum of radiation caused by electron transitions within an atom; the series of spectrum lines is characteristic of the element atomic spectrum
luminous radiation aura
radiogram produced by radiation emitted by the specimen being photographed autoradiograph
producing a radiograph by means of the radiation emitted from the specimen being photographed autoradiography
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