The annual limit for skin and extremities is typically how many mSv per year?

• A. Typically 50 mSv per year.
• B. Typically 500 mSv per year.
• C. Typically 5 Sv per year.
• D. Typically 1 Sv per year.

Answer: (B)

Different tissues have different dose limits. The skin and extremities can receive a larger localized dose than the whole body, so the annual limit is set higher to reflect the tolerance of non-vital tissue while still protecting against harm from excessive exposure. The established limit for skin and extremities is 500 mSv per year (0.5 Sv). This is higher than the whole-body occupational limit, which is 20 mSv per year, because we’re accounting for exposure that is localized to hands, skin, or similar areas. The other options are not used for this tissue; 50 mSv is too low, and 1 Sv or 5 Sv would exceed standard protection guidelines for a single year.