When an electron traveling at high speed strikes a target atom, it will be slowed or completely stopped by the gravitational forces of that atom (Figure 1). Based on the law of conservation of energy, the kinetic energy of the incoming electron cannot be lost and must be absorbed by the atom or converted to another form of energy. About 99% of this kinetic energy will be converted into heat and the remaining will be converted to a radiating energy that is known as x-ray.2,3,4,5,6
If the electron is completely stopped by the gravitational forces of an atom, the x-ray energy will be equal to the total kinetic energy of the electron. The electrons that are not completely stopped will interact with new atoms in a similar fashion to produce more radiation but at lower energy levels. This will result in a continuous spectrum of x-rays varying from very low energies to very high energies (Figure 2).7
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