Josh Landis, Dartmouth College (IMAGE) Dartmouth College Caption Dartmouth research associate Joshua Landis prepares to introduce a radioactive sample into a gamma-ray spectrometer. Credit Eli Burak 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.