Radiophobia is an abnormal fear of ionizing radiation, also used in the sense of fear of X-rays. The term is used in several related senses: in reference to a neurological disorder, to a specific phobia, and (polemically, not medically) to general opposition to the use of nuclear energy.
Fear of ionizing radiation is not unnatural, since it can be pose significant risks; however this fear may become abnormal and even irrational, often owing to poor information or understanding, but also as a consequence of traumatic experience.