Radiotherapeutics is a term used to describe the use of radiation to treat illnesses, particularly cancer. There are several synonyms that can be used to describe this type of treatment, including radiation therapy, radiotherapy, and radiation oncology. These terms all refer to the same concept of using high-energy radiation to kill cancer cells and shrink tumors. Other related terms may include radiology, which is the study and use of medical imaging techniques, such as X-rays, to diagnose disease, and nuclear medicine, which involves the use of radioactive materials to diagnose and treat a variety of conditions.