What syndrome occurs at a dose greater than 5,000 rad?

Central Nervous System Syndrome occurs at doses greater than 5,000 rad, marking it as one of the most severe effects of radiation exposure. This syndrome is characterized by significant impairment of the central nervous system due to the extremely high dose of radiation, which leads to rapid onset of symptoms. The severity of the dosage affects the brain and spinal cord, resulting in immediate and profound neurological effects, which can include confusion, seizures, and loss of consciousness, often leading to death within days.

In contrast, the other listed syndromes occur at lower radiation doses. Hematologic Syndrome typically manifests from doses of around 1,000 to 5,000 rad and primarily affects blood cell production, resulting in symptoms like bleeding and infection. Gastrointestinal Syndrome appears after doses between approximately 600 to 1,000 rad, causing severe nausea and diarrhea due to damage to the intestinal lining. Temporary Epilation is unrelated to life-threatening conditions and can occur at lower doses, often resulting in hair loss, which is generally reversible. Understanding these distinctions is essential for recognizing the severity of radiation exposure effects and their dose thresholds.