Ac-225 (IMAGE) DOE/Oak Ridge National Laboratory Caption A purified sample of actinium-225, produced at ORNL's Radiochemical Engineering Development Center, glows blue when the air that surrounds it is ionized by alpha particles. Credit ORNL, U.S. Dept. of Energy Usage Restrictions Credit to ORNL 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.