The threshold erythema dose for skin is:

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The threshold erythema dose (TED) for skin is the amount of radiation required to cause reddening of the skin. This is commonly measured in units of radiation absorbed dose (rad) or millirads (mrad). The typical threshold for skin is 250 rad or 2500 mrad, but it is usually expressed as a weekly or biweekly limit to account for occupational exposure. Option B is the only one that mentions a limit per 14-day period, which is a common way to express weekly limits in radiation safety. Options A, C, and D are not accurate TED values for skin.

The Threshold Erythema Dose for Skin Is