What is the depth of Dmax for a 10x10 cm field at 10 MV?

The concept of Dmax, or the depth of maximum dose, is critical in radiation therapy as it indicates the depth at which the highest radiation dose is delivered to the target tissue. For 10 MV photon beams, Dmax typically ranges between 2.5 cm and 4 cm, depending on various factors such as field size and tissue composition.

For a 10x10 cm field size at 10 MV, the depth of Dmax is most commonly around 3.0 cm. This value is established by empirical measurements and clinical practices that have determined the dose distribution characteristics of megavoltage photon beams.

Considering other options, they either overestimate or underestimate the expected Dmax for a 10 MV beam in clinical usage. Values like 2.5 cm would be closer to the Dmax for lower energy beams while 3.5 cm or 4.0 cm typically correspond to larger field sizes or different beam energies. Therefore, 3.0 cm is the most accurate representation of the Dmax for a 10x10 cm field at 10 MV, aligning with established dosimetric data.