What happens to tissue interactions as the energy of photons increases?

As the energy of photons increases, tissue interactions tend to decrease. This is primarily due to the nature of photon interactions with matter. At lower energies, photons are more likely to undergo interactions such as photoelectric effect and Compton scattering, which both result in the absorption or scattering of radiation in tissues.

However, as photon energy increases, the likelihood of these interactions diminishes. High-energy photons are more likely to pass through the tissue without interacting, as they can travel through more densely packed materials without being absorbed. This tends to reduce the overall interaction rate with biological tissues.

In summary, the higher energy photons are less likely to interact with tissues, leading to the conclusion that tissue interactions decrease as photon energy increases. This is consistent with the principles of radiation physics and is important for understanding the implications of imaging techniques and radiation safety in medical settings.