Radiologic and nuclear medicine studies in the United States and worldwide: frequency, radiation dose, and comparison with other radiation sources--1950-2007.

The U.S. National Council on Radiation Protection and Measurements and United Nations Scientific Committee on Effects of Atomic Radiation each conducted respective assessments of all radiation sources in the United States and worldwide.

Medical radiation exposure in the U.S. in 2006: preliminary results.

Medical radiation exposure of the U.S. population has not been systematically evaluated for almost 25 y.

Nuclear medicine exposure in the United States, 2005-2007: preliminary results.

Medical radiation exposure of the U.S. population has not been systematically evaluated for almost 25 years.