Stanley Thomas Fricke, Nucl. Eng., Ph.D. (IMAGE) Children's National Hospital Caption This is Stanley Thomas Fricke, Nucl. Eng., Ph.D., radiation safety officer at Children's National Health System and study senior author. Credit Children's National Health System Usage Restrictions Please credit Children's National Health System License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.