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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.ee also median effective dose. erythema dose that amount of radiation that, when applied to the skin, causes erythema (temporary reddening). fatal dose lethal dose.
From Wikipedia, the free encyclopedia. The name LD50 is an abbreviation for Lethal Dose, 50% or median lethal dose. It is the amount of the substance required (usually per body weight) to kill 50% of the test population.The test was created by J.W. Trevan in 1927 but has been phased out.rom Wikipedia, the free encyclopedia. The name LD50 is an abbreviation for Lethal Dose, 50% or median lethal dose. It is the amount of the substance required (usually per body weight) to kill 50% of the test population.