What is the purpose of kerma in radiation therapy?

The purpose of kerma, which stands for Kinetic Energy Released per unit MAss, is to quantify the energy transferred from radiation to the medium through which it passes. In the context of radiation therapy, kerma is especially important because it provides a measure of the initial energy imparted to electrons by ionizing radiation before they lose energy through interactions such as scattering and absorption in tissue. This concept is crucial for understanding how much energy is initially available to produce biological effects in the target tissue.

Quantifying absorbed energy is integral for accurately calculating treatment doses in radiation therapy. It allows dosimetrists to plan and deliver the precise amount of energy required to effectively treat tumors while minimizing damage to surrounding healthy tissues. Thus, understanding kerma and its relationship to the dose distribution is key for optimizing radiation treatment plans and ensuring patient safety.