Final answer:
The approximate dose that causes the formation of a cataract in the lens of the eye according to ICRP41 is 0.5 Sv.
Step-by-step explanation:
According to ICRP Publication 41, the approximate dose in sieverts that causes the formation of a cataract in the lens of the eye is 0.5 Sv. Cataracts are a clouding of the crystalline lens in the eye which can significantly impair vision. Protection from such radiation exposure is crucial, especially for those individuals who are at higher risk due to occupational or medical exposure.
However, based on the information available up to ICRP Publication 103, a threshold dose of about 0.5 sieverts (Sv) was often considered for the induction of cataracts. Therefore, among the given options:
a) 0.5 Sv
This option is consistent with the historical threshold for cataract induction. Please note that guidelines and recommendations may be updated over time, so it's always a good idea to refer to the latest publications and guidelines for the most current information.