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Inverse Square Law
the intensity of the radiation varies inversely as the square of the distance from the source
related to thousands of volts. Describes the electrical potential (differences) between the cathode and the anode; it is responsible for accelerating the electrons from the cathode to the anode and relates to the penetrating power the x-rays.
the number of x-rays produced over a given period. Calculated by multiplying the milliamperage by the time
one thousandth of an ampere. A measure of electron current to the filament, which has a direct relationship to the number of x-rays produced.
a method of estimating kilovoltage in relation to area thickness (2x thickness) +40 = kVp
Source-image distance (SID)
formerly called focal-film distance (FFD) the distance between the source of x-rays and the image receptor or film
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