An established reference dose (RfD) is defined as the amount of a contaminant to which people can be exposed over a 24-hour period without harm.

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An established reference dose (RfD) is defined as an estimate of the daily exposure to the human population (including sensitive subgroups) that is likely to be without an appreciable risk of deleterious effects during a lifetime; it is not limited to a 24-hour period.

An Established Reference Dose (RfD) Is Defined as the Amount