Which group is more sensitive to radiation exposure?

Which group is more sensitive to radiation exposure?

• A. Older
• B. Younger
• C. Animals
• D. People with prior exposure

Answer: (B)

Sensitivity to radiation is higher when the body is still growing and tissues are rapidly dividing. In younger individuals, many cells are in active division as organs and systems develop, so ionizing radiation can more readily cause DNA damage that disrupts development, leads to mutations, or triggers cell death. This makes developing tissues particularly vulnerable to both immediate and long-term effects. Another part of the reason is lifetime risk. A younger person has many more years ahead in which radiation-induced effects, such as cancer, can manifest. That extended window increases the overall risk from a given dose compared with someone who is older, whose tissues are more mature and have less rapid cell turnover. In contrast, older individuals generally have slower cell division and more mature organs, so the same dose tends to produce fewer disruptive effects. While animals and people with prior exposure have their own contexts, the overarching pattern is that younger individuals are more sensitive to radiation exposure.

Sensitivity to radiation is higher when the body is still growing and tissues are rapidly dividing. In younger individuals, many cells are in active division as organs and systems develop, so ionizing radiation can more readily cause DNA damage that disrupts development, leads to mutations, or triggers cell death. This makes developing tissues particularly vulnerable to both immediate and long-term effects.

Another part of the reason is lifetime risk. A younger person has many more years ahead in which radiation-induced effects, such as cancer, can manifest. That extended window increases the overall risk from a given dose compared with someone who is older, whose tissues are more mature and have less rapid cell turnover.

In contrast, older individuals generally have slower cell division and more mature organs, so the same dose tends to produce fewer disruptive effects. While animals and people with prior exposure have their own contexts, the overarching pattern is that younger individuals are more sensitive to radiation exposure.