Rajeev Saraswat (Physical Properties Specialist, National Institute of Oceanography, India) loads a core section into the Natural Gamma Radiation Logger (NGRL). Sediment such as clay that is derived from the continent contains more radioactive isotopes (potassium, thorium, and uranium) than sediment composed of the fossil remains of marine plankton. The NGRL detects gamma rays emitted by these isotopes and gives us a glimpse of the type of sediment contained in the core before the section is split. (Credit: Bill Crawford, IODP JRSO) [Photo ID: exp355_087]