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For a bodyweight around 70 kg (155 lb.), the lethal dose of arsenic would be closer to a gram than 100 mg. Current Queue | Current Queue for Medicine | Medicine archives Try the links in the MadSci Library for more information on Medicine.
median lethal dose (LD 50) the quantity of an agent that will kill 50 per cent of the test subjects; in radiology, the amount of radiation that will kill, within a specified period, 50 per cent of individuals in a large group or population.ffective dose (ED) that quantity of a drug that will produce the effects for which it is administered. See also median effective dose. erythema dose that amount of radiation that, when applied to the skin, causes erythema (temporary reddening). fatal dose lethal dose.