According to current ICRP recommendations, the threshold absorbed dose to the lens of the eye for radiation-induced cataract formation is approximately:
- A 5 Gy
- B 2 Gy
- C 0.5 Gy ✓
- D 0.05 Gy
Correct answer: C. 0.5 Gy
Explanation
The ICRP revised the threshold for lens opacity and cataract downwards to 0.5 Gy based on evidence from interventional cardiologists and Chernobyl cleanup workers who developed opacities at lower doses than previously believed. The older teaching value was 2 Gy for detectable opacity and 5 Gy for visual impairment, so option B reflects outdated data. This revision led to the reduced occupational annual lens equivalent dose limit of 20 mSv per year.
Reference: ICRP Publication 118, 2012 ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.