Lauren Kipp, Woods Hole Oceanographic Institution (IMAGE) Woods Hole Oceanographic Institution Caption Lauren Kipp, a graduate student in the MIT-WHOI Joint Program in Oceanography, led efforts to measure radium-228 in the Arctic Ocean. The naturally occurring isotope is used to track the flow of material from land and sediments into the open ocean. Here, she removes a cartridge from a sampling instrument that pumps seawater through the cartridges to collect chemical isotopes. Credit Cory Mendenhall, U.S. Coast Guard Usage Restrictions with proper credit 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.