What unit is used for the lens dose limit for the eye?

What unit is used for the lens dose limit for the eye?

• A. Sv
• B. Gy
• C. rem
• D. mSv

Answer: (D)

The lens dose limit is expressed as an equivalent dose to the lens, using the sievert scale. Since the eye is highly radiosensitive, regulatory limits are small and reported per year in millisieverts (mSv). Absorbed dose units like gray (Gy) reflect energy deposited, not biological effect, so they’re not used for dose limits to a specific organ. The rem is an older unit equal to 0.01 Sv, but modern practice uses Sv or its submultiples, with the typical eye-lens limit stated in mSv per year (for example, about 20 mSv/year). Therefore, the unit used for the lens dose limit is millisieverts.

The lens dose limit is expressed as an equivalent dose to the lens, using the sievert scale. Since the eye is highly radiosensitive, regulatory limits are small and reported per year in millisieverts (mSv). Absorbed dose units like gray (Gy) reflect energy deposited, not biological effect, so they’re not used for dose limits to a specific organ. The rem is an older unit equal to 0.01 Sv, but modern practice uses Sv or its submultiples, with the typical eye-lens limit stated in mSv per year (for example, about 20 mSv/year). Therefore, the unit used for the lens dose limit is millisieverts.