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|Noun||1.||counter tube - a measuring instrument for counting individual ionizing events|
crystal counter - a counter tube in which an ionizing event increases conductivity
measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
proportional counter, proportional counter tube - counter tube whose output pulse is proportional to number of ions produced
scintillation counter - counter tube in which light flashes when exposed to ionizing radiation