NAUTILUS (IMAGE) Naval Research Laboratory Caption Evan Groopman, a research physicist, prepares a microscopic uranium particle sample to be measured in the NAUTILUS instrument in the Accelerator Mass Spectrometry Laboratory at the U.S. Naval Research Laboratory in Washington, D.C., Sept. 5. Credit (U.S. Navy photo by Nicholas E. M. Pasquini) Usage Restrictions None 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.