What is a common effect of low-dose radiation exposure that may develop many years later?

• A. Radiation burns
• B. Leukemia
• C. Acute radiation syndrome
• D. Cataracts

Answer: (B)

Low-dose radiation exposure is associated with various delayed effects, and one of the most well-documented outcomes is the increased risk of developing leukemia. This relationship is particularly significant because leukemia, a type of cancer affecting the blood and bone marrow, may take years or even decades to manifest following exposure to ionizing radiation.

The mechanism behind this involves the potential for radiation to cause genetic damage and mutations in the DNA of bone marrow cells. Over time, these mutations can lead to the uncontrolled proliferation of abnormal cells, which characterizes leukemia. The latency period for radiation-induced leukemia typically ranges from 5 to 15 years, emphasizing the long-term concern in populations exposed to even low levels of radiation over an extended period.

In contrast, options such as radiation burns typically occur with higher doses of radiation and present immediately or soon after exposure. Acute radiation syndrome, similarly, is associated with high-dose exposures and results in rapid onset of symptoms. Cataracts can also develop as a result of radiation exposure, but generally, the association is more pronounced with higher doses, and the timeframe for development is more variable. Therefore, the progressive nature of leukemia development distinctly aligns with the characteristics of delayed effects from low-dose radiation exposure.