Professor Igor Jovanovic and Jason Nattress, University of Michigan (image) Georgia Institute of Technology Share Print E-Mail Caption Professor Igor Jovanovic and graduate student Jason Nattress are shown in front of an ion accelerator at the Michigan Ion Beam Laboratory. Beams produced by this type of source have been used to interrogate shielded special nuclear materials. Credit Courtesy Igor Jovanovic Usage Restrictions None Share Print E-Mail 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.