Pair Production in X-Ray💥

Pair production (PP) 

Can occur when the x-ray photon energy is greater than 1.02 MeV, but really only becomes significant at energies around 10 MeV.

In this process, the photon interacts strongly with the electromagnetic field of an atomic nucleus and gives up all its energy in the process of creating a pair consisting of a negative electron (e-) and a positive electron(e+).

Because the rest mass energy of the electron and positron is equivalent to 0.51 MeV and 0.51MeV, a minimum energy of 1.02 MeV is required to create the pair of electrons. Thus the threshold energy for the pair production process is 1.02 MeV. The photon energy in excess of this threshold is shared between the particles as kinetic energy.

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