What does the abbreviation mA stand for in x-ray equipment terminology?

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mA stands for milliampere, a unit of electric current that measures how many electrons flow from the cathode to the anode in the X-ray tube each second. In dental radiography, this current determines how many X-ray photons are produced per unit time: more current means more photons, more exposure on the image receptor, and a higher patient dose. The total exposure is commonly described as mAs, the product of the current and the exposure time, but the symbol mA itself refers to the instantaneous tube current. The other options don’t fit because meg amperes would be an unrealistically large current for dental machines, milliampere-second describes a quantity of exposure (current times time) rather than the current itself, and milliampere-hour isn’t used in radiography.