Connections between the specific absorption rate and the local temperature
“The specific absorption rate (SAR) characterizes the energy intake from outside energy sources. Dominantly, the dosing of electromagnetic radiation uses the SAR, defining the absorbed power in unit mass, measured in W/kg. Ionisation radiation creates a certain distortion in the DNA, which is the goal of radiation in oncology. The dose in this case counts the time duration of the actual SAR, and uses the absorbed energy instead of the absorbed power, measured by Gy (=1/kg). The ionizing rate is the desired result, and the developed temperature is only an unwanted side effect.