<prompt> Maximum radiation exposure is byRadiographyCT abdomenRadionuclide scanX-ray Abdomen  <response>: Examination Effective total dose mSv Chest radiograph 0.06 Skull radiograph 0.2 Pelvis radiograph 0.65 Lumbar spine radiograph 1.3 Upper GI series Barium 2.45 Abdomen radiograph 0.55 Barium enema 2.8 to 4 IVPIVU 1.6 Extremities 0.01 Enteroclysis 1.5 CT chest 8 CT abdomen 10 CT head 3.5 RNI 4.8 