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Focal spot is the area of the anode surface which receives the beam of electrons from the cathode. It is the apparent source of x-rays . Subsequently, one may also ask, what is the actual focal spot? a circumscribed area or place, usually distinguished by its color; see also macula and tache. actual focal spot the section of a focal spot on which there is intersection of an electron beam with an anode of an x-ray tube. where is the focal spot on ax ray tube? The radiation is produced in a very small area on the surface of the anode known as the focal spot . The dimensions of the focal spot are determined by the dimensions of the electron beam arriving from the cathode. In most x- ray tubes , the focal spot is approximately rectangular. Also question is, what is the difference between actual focal spot and effective focal spot? Refers to the focal spot size when measured directly under the anode target. The actual is measured on the target itself. Actual Focal Spot does N...