What is the unit of measure for exposure time in radiography?

In radiography, the unit of measure for exposure time is seconds (s). Exposure time refers to the duration for which the x-ray beam is active and is crucial in determining the quantity of radiation that reaches the image receptor.

When the exposure time is adjusted, it directly influences the density and quality of the radiographic image. Longer exposure times allow more radiation to interact with the imaging receptor, which can result in a more pronounced image, assuming other parameters remain constant.

The other options refer to different aspects of the radiographic process. Milliamperage (mA) measures the tube current, influencing the number of x-rays produced per unit time but not the duration of exposure. Kilovoltage peak (kVp) refers to the peak voltage applied across the x-ray tube, which affects the energy and penetration of the x-rays but does not indicate the time the beam is active. Milligray per second (mGy/s) is a unit measuring the exposure rate or dose delivered per second, not the duration of that exposure. Thus, when considering the specific measurement of exposure time, seconds is the correct and appropriate unit.