Rajeev Yadav (Petrophysics [Physical Properties] Specialist, National Centre for Antarctic and Ocean Research [NCAOR], India) places a whole-round section of core into the natural gamma ray sensor. Natural radiation detection is key in determining certain types of clays and minerals. This is one of the non-destructive kinds of testing done that does not change the content of the sample. (Credit: William Crawford, IODP JRSO) [Photo ID: exp367_155]