Which of the following are LONG TERM stepwise effects of radiation exposure? 1) damage to genetic structures 2) cancer 3) cataract formation

• A. 2 and 3
• B. 1 and 2
• C. 1 and 3
• D. 1, 2, and 3

Answer: (A)

Long-term late effects from radiation exposure develop after a latent period and often evolve as cumulative damage over time. Cancer and cataract formation fit this pattern well. Cancer results from a series of genetic alterations accumulating in cells over years or decades, with risk rising as dose increases; the process is effectively multi-step, reflecting multiple genetic events needed for a malignant change. Cataracts in the eye lens also tend to appear long after exposure and can progress in stages as radiation-induced damage to lens fibers accumulates. Damage to genetic structures, while it can be a concern for hereditary effects in offspring, does not represent a progressive late change within the irradiated individual in the same way and is not the type of long-term, stepwise effect described here.