Which 3 interactions between ionizing radiation and tissues occur at energies within the diagnostic range of 20 to 150 kV?

The correct answer highlights three significant interactions that occur between ionizing radiation and tissues within the diagnostic energy range of 20 to 150 kV. Specifically, the photoelectric effect, Compton scattering, and classical (or Rayleigh) scattering are the three primary interactions relevant in this context.

The photoelectric effect is a critical mechanism where the energy of incoming photons is completely absorbed by an inner-shell electron, leading to its ejection from the atom. This effect is more pronounced at lower energies and in tissues with higher atomic numbers, making it particularly relevant for imaging techniques like radiography.

Compton scattering is another major interaction occurring in the diagnostic range, where an incoming photon transfers a part of its energy to a free or loosely bound electron, causing the photon to change direction and lose energy. This scattering process significantly contributes to image contrast reduction and patient dose in radiographic procedures.

Classical scattering involves the elastic scattering of low-energy photons by atoms without energy transfer. While it may not significantly contribute to image formation, it is still a noted interaction in the diagnostic range.

In this context, bremsstrahlung radiation primarily pertains to the radiation produced when high-speed electrons are decelerated in a material, notably in the context of x-ray tube operations rather