What is the annual occupational dose equivalent limit as set by 10 CFR 20, for the lens of the eye?

• A. 15 rem or .15 Sv
• B. 5 rem or .05 Sv
• C. 1.5 rem or .015 Sv
• D. 50 rem or .5 Sv

Answer: (A)

The lens of the eye is especially radiosensitive, and cataract formation can occur at relatively low radiation doses. Because of this, regulatory bodies set a specific annual occupational dose limit for the eye to protect vision. Ten CFR 20 specifies that the annual dose limit to the lens of the eye is 15 rem, which is 0.15 Sv (150 mSv). This limit is lower than the whole-body limit to acknowledge the eye’s higher sensitivity and to keep the risk of radiation-induced cataracts acceptably low. In practice, radiation workers should monitor eye dose separately, use protective measures such as shielding and appropriate eyewear, and apply ALARA to stay well within this limit.