Radiation sickness, also known as acute radiation syndrome (ARS), is a serious illness that occurs when a person is exposed to high levels of radiation, typically in a short period of time. This exposure damages the body's cells, especially those that rapidly divide, such as those in the bone marrow, gastrointestinal system, and skin. Symptoms of radiation sickness can include nausea, vomiting, diarrhea, fever, weakness, and hair loss. In serious cases, it can lead to organ failure, bone marrow problems, and death. Treatment for radiation sickness typically involves supportive care to manage symptoms and protect the body's organs while they recover from the effects of radiation exposure. The seriousness of radiation sickness depends on the dose of radiation received, the duration of exposure, and the type of radiation involved. Preventive measures, such as radiation shielding and monitoring, are important for minimizing the risk of radiation sickness in situations where exposure to radiation is possible.

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