Thorium-228 dry down (IMAGE) DOE/Oak Ridge National Laboratory Caption Thorium-228 is dried down to thorium nitrate for shipping to a customer. The isotope is a byproduct of actinium-227 production at ORNL that has medical uses as well. Credit ORNL/U.S. Dept. of Energy Usage Restrictions Credit 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.