Which group is highly sensitive to radiation?

• A. Healthy adults
• B. Children
• C. Elderly
• D. Pregnant women

Answer: (D)

Sensitivity to radiation changes with development. The fetus, as the developing tissue inside a pregnant woman, is highly radiosensitive because cells are rapidly dividing and organs are forming. Even small doses can carry risks to fetal development and future health, which is why protecting the fetus is a central concern in dental imaging when pregnancy is known or suspected.

Among the groups listed, the pregnant woman represents this heightened sensitivity due to the fetal stage. That’s why this option is considered highly sensitive in radiation safety contexts. Healthy adults are the least sensitive among the options, while children are more sensitive than adults but not to the same level of a developing fetus. This understanding reinforces the importance of strict justification for imaging during pregnancy, using shielding, and applying ALARA to minimize any fetal exposure.