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| i·on·i·za·tion cham·ber (plural i·on·i·za·tion cham·bers) |
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device for measuring ionizing radiation: a device used to detect and measure ionizing radiation, consisting of a gas-filled tube with electrodes at each end between which a voltage is maintained. Radiation that ionizes gas molecules in the tube causes a current between the electrodes, the strength of which is a function of the radiation's intensity.
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