Joshua Woods and Appie Peterson (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Joshua Woods and Appie Peterson measure a small sample of actinium. Credit Marilyn Sargent/Berkeley Lab Usage Restrictions N/A License Original 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.