Radiobiology > Physical Processes > Atomic and Molecular Interactions > Pair Production

Pair Production

Note pair production requires relatively high photon energies that are generally not produced in diagnostic imaging.  

Photons with quantum energy in excess of 1.02 MeV (usually >10 MeV) may interact with matter to produce a negative electron and its anti-particle (positron). The value of 1.02 MeV equals the combination rest mass energy of an electron and a positron.  


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