Blast Badge (IMAGE) University of Pennsylvania School of Medicine Caption Blast exposure disrupts the nanostructure of the blast injury dosimeter, resulting in clear changes in color. The color changes may be calibrated to denote the severity of blast exposure in relation to thresholds for blast-related traumatic brain injury. Credit Douglas Smith, MD, University of Pennsylvania School of Medicine, NeuroImage. Usage Restrictions None 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.