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ionization chamber

i·on·i·za·tion cham·ber (plural i·on·i·za·tion cham·bers)


noun 
Definition:
 
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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