Crystal Schematic (IMAGE) Northwestern University Caption Interaction of gamma rays with cesium lead bromide crystals. Perovskite crystal structure of where the corner-sharing lead bromide octahedra form a three-dimensional atomic framework. The cesium atoms are shown in green. Credit Northwestern University Usage Restrictions Credit must be given 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.