{"thcode":61,"term":{"code":510,"name":"tritium-helium dating","parent":504,"scope":"absolute dating technique based on the decay of tritium (hydrogen-3) to helium-3; a short-range method for dating water samples."},"uf":[{"name":"tritium analysis","usewith":false}],"bt":[{"code":504,"name":"radiometric dating","parent":502,"scope":"used for all absolute dating techniques based on analyzing the abundance of a radioactive isotope and its decay products in a given geologic (or archaeologic) sample."},{"code":502,"name":"absolute dating (geologic)","parent":501,"scope":"used for all geologic dating methods yielding numerical ages"},{"code":501,"name":"geologic dating","parent":486,"scope":"used for all methods of dating geologic (or archaeologic) materials, including both absolute dating methods (yielding numerical ages) relative dating methods (for determining the relative order of geologic events)."},{"code":486,"name":"laboratory methods","parent":398,"scope":"used for all laboratory procedures in support of scientific investigations."},{"code":398,"name":"research method","parent":1,"scope":null},{"code":1,"name":"Marine Realms Information Bank (MRIB) keyword categories","parent":null,"scope":null}],"nt":[],"rt":[]}