As the energy of incoming X-rays increases, the probability of the photoelectric effect and Compton scattering decreases. However, at energies above 1.02 MeV another effect, pair production, takes place. Why does pair production NOT play any role in X-ray diagnostics, but only in radiotherapy?

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The Answer of As the energy of incoming X-rays increases, the probability of the photoelectric effect and Compton scattering decreases. However, at energies above 1.02 MeV another effect, pair production, takes place. Why does pair production NOT play any role in X-ray diagnostics, but only in radiotherapy?

As the Energy of Incoming X-Rays Increases, the Probability of the Photoelectric