Which measurement indicates the quantity of x-rays produced in an exposure?

The quantity of x-rays produced during an exposure is indicated by the current, also known as milliAmperage (mA). This measurement reflects the number of electrons flowing through the x-ray tube per unit time, which directly correlates with the amount of x-ray photons generated during a radiographic exposure. An increase in mA leads to more electrons hitting the target in the x-ray tube, resulting in a higher production of x-rays.

Although kilovoltage peak (kVp) is important as it influences the penetrability and quality of the x-rays produced, it does not measure the quantity of x-rays. Exposure time affects the overall number of x-rays but in a more indirect manner, as it works in conjunction with mA to determine the total exposure. Voltage is a measure of electric potential but does not directly correlate to the amount of x-rays emitted. Therefore, mA is the most direct and accurate measurement to indicate the quantity of x-rays produced during an exposure.