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

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

• A. 5 rem or 0.05 Sv
• B. 50 rem or 0.5 Sv
• C. 1.5 rem or 0.015 Sv
• D. 15 rem or 0.15 Sv

Answer: (D)

The lens of the eye is more sensitive to ionizing radiation than many other tissues, so regulators set a specific dose limit for it to reduce the risk of radiation-induced cataracts. The annual occupational dose limit for the lens is 15 rem, which is 0.15 Sv. Since 1 Sv equals 100 rem, 0.15 Sv converts to 15 rem. This lens limit is higher than the whole-body limit (5 rem) to reflect the distinct sensitivity of the eye while still providing a firm cap to protect vision. So, the maximum allowed dose to the lens in a year is 15 rem (0.15 Sv).

The lens of the eye is more sensitive to ionizing radiation than many other tissues, so regulators set a specific dose limit for it to reduce the risk of radiation-induced cataracts. The annual occupational dose limit for the lens is 15 rem, which is 0.15 Sv. Since 1 Sv equals 100 rem, 0.15 Sv converts to 15 rem. This lens limit is higher than the whole-body limit (5 rem) to reflect the distinct sensitivity of the eye while still providing a firm cap to protect vision. So, the maximum allowed dose to the lens in a year is 15 rem (0.15 Sv).