Which group exhibits the lowest radiosensitivity?

• A. Females
• B. Males
• C. Children
• D. Unborn children

Answer: (B)

Radiosensitivity follows how fast cells divide and how developed the tissues are. Unborn children have tissues that are rapidly dividing and differentiating, so they’re highly susceptible to radiation. Children also have a lot of dividing cells, keeping sensitivity relatively high. As people reach adulthood, cell turnover slows and tissues are more mature, so overall radiosensitivity decreases. Among adults, gender differences exist because certain female tissues (like ovaries and breast tissue) can be more radiosensitive, while male tissues are generally less sensitive on the whole. So, the group with the lowest radiosensitivity among these options is males.