Extreme doses of radiation can lead to death within which time frame?

• A. Months
• B. Hours, days or weeks
• C. Decades
• D. Years

Answer: (B)

Extreme doses trigger a rapid collapse of multiple body systems, so death tends to occur quickly after exposure. When the dose is extremely high, the central nervous system and cardiovascular systems fail soon, and death can happen within hours to a few days. If the dose is still very high but not instantly fatal to the CNS, death often follows within days to weeks due to GI or bone marrow failure. Days to weeks capture the typical window for extreme acute radiation exposure, whereas months, years, or decades describe outcomes from long-term effects or lower-dose exposures, not the immediate fatal course after a very high dose.