Based on studies of atomic bomb survivors, radiation cataract formation requires a single dose of what Gy?

The formation of radiation cataracts, particularly as observed in studies of atomic bomb survivors, has been associated with certain thresholds of radiation exposure. Research indicates that cataract formation is likely to occur at doses starting around 1.3 Gy and can occur more frequently with higher exposures, up to 2 Gy or more.

This range reflects significant findings from epidemiological studies that tracked survivors over time, illustrating that as doses of ionizing radiation increase, so does the risk of cataract development. The evidence supports the concept that a dose threshold exists for cataract induction, with 1.3 Gy being a critical level where noticeable effects begin to manifest. Therefore, this threshold aligns with an understanding of radiation biology and the dose-response relationship regarding lenticular (lens of the eye) damage caused by ionizing radiation.

Other options setting lower thresholds do not align with the documented evidence of cataract induction from radiation exposure, which establishes that 1.3 Gy is a pivotal point recognized in the literature related to radiation cataract formation.