Which factor does NOT affect the quantity of radiation scattering?

The quantity of radiation scattering is influenced by several physical properties of the tissue and the conditions under which radiation is applied. Tissue density, field size, and part thickness all play significant roles in how much radiation is scattered.

Tissue density directly impacts scattering because denser materials have more atoms that can interact with the radiation, resulting in increased scattering. The larger the field size, the greater the likelihood of interaction with tissue, thus influencing the scattering quantity. Similarly, part thickness affects how much radiation is absorbed or scattered; thicker parts generally lead to increased scattering as the radiation has to pass through more material.

In this context, patient age does not have a direct effect on the quantity of radiation scattering. While different age groups may have variations in tissue composition or density, age itself does not serve as a fundamental factor in the physics of scattering mechanisms. Therefore, patient age is correctly identified as the factor that does not influence the quantity of radiation scattering.