When expressed in terms of AKS, the dose prescription must be indicated in what units?

The correct answer is expressed in Gy m², which is aligned with the standard unit of measurement for radiation dose in the context of medical dosimetry. The Gy (Gray) is the SI unit used to measure absorbed dose, or the amount of radiation energy deposited in a mass of tissue. When planning and prescribing doses in radiation therapy, it is essential to specify the dose per unit area, hence the area is represented in square meters (m²).

This unit of measure is critical as it relates to the concept of dose distribution over the treatment area. The use of Gy m² allows for a precise specification of how much of a dose will be delivered across a larger treatment region, informing decisions about treatment planning and ensuring effective and safe radiation delivery. This metric is also relevant for parameters like the therapeutic index, area coverage, and uniformity of dose distribution.

Other units, such as cGy (centiGray), Gy cm², or Gy h, do not fit the standard prescription needs for AKS. While cGy is an alternative unit that is sometimes used, especially for smaller doses, it is less common in official prescription contexts where Gy is the standard. Gy cm² would incorrectly imply an emphasis on centimeter-scale areas rather than the broader