Which two body areas share the same annual dose limit of 50 rem/yr?

Which two body areas share the same annual dose limit of 50 rem/yr?

• A. Skin and Extremities
• B. Lens of the Eye and Skin
• C. TEDE and Extremities
• D. Lens of the Eye and TEDE

Answer: (A)

Dose limits are set for specific body parts because different tissues have different sensitivities and risks. The skin and the extremities are allowed the same higher annual limit of 50 rem because localized exposure to these areas poses less threat to vital body function than exposure to more sensitive tissues or to the whole body. In contrast, the lens of the eye is more sensitive and has a lower limit (15 rem per year), and the total effective dose equivalent (TEDE) reflects whole-body risk with its own limit (5 rem per year). So, the two body areas that share the 50 rem/yr limit are the skin and the extremities.

Dose limits are set for specific body parts because different tissues have different sensitivities and risks. The skin and the extremities are allowed the same higher annual limit of 50 rem because localized exposure to these areas poses less threat to vital body function than exposure to more sensitive tissues or to the whole body. In contrast, the lens of the eye is more sensitive and has a lower limit (15 rem per year), and the total effective dose equivalent (TEDE) reflects whole-body risk with its own limit (5 rem per year). So, the two body areas that share the 50 rem/yr limit are the skin and the extremities.