Radiation sickness: MedlinePlus Medical Encyclopedia

Radiation sickness results when humans (or other animals) are exposed to very large doses of ionizing radiation. Radiation exposure can occur as a single large exposure ().Or it can occur as a series of small exposures spread over time ().Exposure may be accidental or intentional (as in radiation therapy for disease treatment).. Radiation sickness is generally associated with acute exposure …

https://medlineplus.gov/ency/article/000026.htm