When radiation exposure occurs during pregnancy,the greatest risk of birth defects occurs when the exposure:
1) to the uterus exceeds 5 rad.
2) occurs within the first trimester of pregnancy.
3) occurs within the third trimester of pregnancy.

Question

Quizplus · Accepted Answer

The greatest risk of birth defects due to radiation exposure during pregnancy is when the exposure to the uterus exceeds 5 rad and occurs within the first trimester of pregnancy. This is because the first trimester is a critical period for organogenesis, and higher doses of radiation can cause significant developmental abnormalities or fetal death.

When Radiation Exposure Occurs During Pregnancy,the Greatest Risk of Birth