What short-term dose range, measured in sieverts, is cited as almost certainly fatal within days or weeks?
Answer
A dose exceeding 10 to 20 sieverts absorbed over a short time
The distinction between survivable and lethal radiation exposure is clearly defined by the magnitude of the dose delivered over a short duration. While lower doses, perhaps only a few sieverts, might result in temporary illness as the body's repair mechanisms attempt to cope, exposure levels significantly higher than this rapidly become terminal. Specifically, absorbing a dose exceeding 10 to 20 sieverts over a compressed period overwhelms all biological defenses, leading to inevitable fatality within days or weeks due to massive systemic molecular breakdown.
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