LD50 refers to?

LD50 refers to?

• A. The concentration of airborne contaminant that kills 50% of test population
• B. The dose required to kill 50% of test population after exposure to air
• C. The amount of an injected or ingested material that'll kill 50% of test population
• D. The time to kill 50% of test population

Answer: (C)

LD50 is the median lethal dose—the amount of a substance that, when it is introduced into the body by injection or ingestion, would kill 50% of a test population. It’s a standard way to gauge acute toxicity and compare how dangerous different chemicals are. The value is usually given as milligrams of substance per kilogram of body weight, and because it depends on how the substance enters the body, you’ll see different LD50 numbers for different routes (inhalation, ingestion, injection). A related measure for airborne exposure is LC50, which uses concentration in air rather than a dose. LD50 values come from animal testing and don’t directly translate to humans or account for chronic effects, but they help scientists compare hazards and guide safety decisions.

LD50 is the median lethal dose—the amount of a substance that, when it is introduced into the body by injection or ingestion, would kill 50% of a test population. It’s a standard way to gauge acute toxicity and compare how dangerous different chemicals are. The value is usually given as milligrams of substance per kilogram of body weight, and because it depends on how the substance enters the body, you’ll see different LD50 numbers for different routes (inhalation, ingestion, injection). A related measure for airborne exposure is LC50, which uses concentration in air rather than a dose. LD50 values come from animal testing and don’t directly translate to humans or account for chronic effects, but they help scientists compare hazards and guide safety decisions.