<prompt> Maximum permissible radiation dose in pregnancy is0.5 rad1.0 rad1.5 rad2 rad  <response>: Maximum permissible dose in pregnancy is 5 mSv 0.5 rem. Rem Rad x Quality factor.Main radiation exposure during pregnancy can be by X-rays radiography or CT, and the quality factor of X-rays is 1. That means Rem Rad.Therefore, the maximum permissible dose in pregnancy is 0.5 rem or 0.5 rad. 