Radiosensitivity refers to the susceptibility of a living organism or tissue to radiation damage. However, there are several synonyms available for the term radiosensitivity that can be used in different contexts. These synonyms include radiobiology, radiotoxicity, radiation susceptibility, radiation sensitivity, radiation reaction, radiation responsiveness, radiation vulnerability, and radioresistance. While some of these terms focus on the negative effects of radiation, such as radiation susceptibility and toxicity, others emphasize the response of the organism or tissue to the radiation, such as radiation responsiveness and resistance. Regardless of the term used, understanding and being able to measure these different forms of radiation effects is crucial in fields such as radiation oncology and nuclear medicine.