According to NCRP recommendations, what is the annual equivalent dose limit to the eye lens?

The annual equivalent dose limit to the eye lens, as recommended by the National Council on Radiation Protection and Measurements (NCRP), is indeed 150 mSv/year. This guideline is established to protect radiation workers and the general public from the potential harmful effects of ionizing radiation, particularly to sensitive areas such as the eye lens, which can be adversely affected by high doses.

The determination of 150 mSv/year as the acceptable limit takes into account the biological effects of radiation exposure specifically on the eye lens, which may lead to cataract formation if exposed to excessive doses over time. By establishing a limit that is viewed as a balance between occupational necessity and safety, the NCRP emphasizes the importance of monitoring and managing radiation exposure in environments where ionizing radiation is prevalent.

In contrast to the other values mentioned, the limit of 100 mSv/year is lower than the current recommendation aimed at ensuring adequate protection while allowing for practical work conditions, whereas 200 mSv/year exceeds the threshold advised by regulatory bodies for eye safety. Similarly, a limit of 50 mSv/year would have been more appropriate in earlier guidance but does not reflect the updated understanding of radiation's effects on the eye lens. Hence, the recommended value is set where it provides an