counter /coun·ter/ (koun´ter) an instrument to compute numerical value; in radiology, a device for enumerating ionizing events.
Coulter counter an automatic instrument used in enumeration of formed elements in the peripheral blood.
Geiger counter , Geiger-Müller counter an amplifying device that indicates the presence of ionizing particles, particularly β particles.
scintillation counter a device for detecting ionization events, permitting determination of the concentration of radioisotopes in the body or other substance.
Gei·ger counter (g  g r)n. An instrument that measures the intensity of radiation by detecting radioactive particles as they cross a metal or glass tube filled with gas, causing ionization of the gas molecules and producing an electrical discharge. Also called Geiger-Müller counter. |
Geiger counter, Geiger-Müller counter
an amplifying device that indicates the presence of ionizing particles emitted by a substance; used as a means of determining the presence of radioactivity.
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