LD50/30
Radiation dose to produce lethality in 50% of a population of individuals within 30 days.
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from ICRP Publication 118, 2012
Radiation dose to produce lethality in 50% of a population of individuals within 30 days; similarly LD50/7, etc.
from ICRP Publication 103, 2007
Dose that is lethal for half of the exposed individuals.