Stencil (IMAGE) Children's National Hospital Caption Unlike the fingertips, infrared light can penetrate the lead apron's protective outer fabric and illuminate defects that are smaller than the defect size now used to reject a protective apron. 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.