https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/6f4e850f-84e4-466f-b5ad-2032ea2187ea RADIOISOTOPES Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Any radioactive form of a chemical element, having the same atomic weight as that element (i.e. same number of protons), but a different number of neutrons. Used in a variety of oceanic applications such as dating and movement of water masses. New Value=Any radioactive form of a chemical element, having the same atomic weight as that element (i.e. same number of protons), but a different number of neutrons. Used in a variety of oceanic applications such as dating and movement of water masses. Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=RADIOISOTOPES [6f4e850f-84e4-466f-b5ad-2032ea2187ea,86245] - ISOTOPES [4d5f7ae1-3368-468b-825b-e72c1df24508,310627] Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=RADIOISOTOPES [6f4e850f-84e4-466f-b5ad-2032ea2187ea,86245] - WATER QUALITY/WATER CHEMISTRY [8c02f5d1-ce86-4bf5-84d5-b3496cdba6ad,83565] Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=Adapted from: Webster's College Dictionary. 1991. Random House. New Value=Adapted from: Webster's College Dictionary. 1991. Random House. Any radioactive form of a chemical element, having the same atomic weight as that element (i.e. same number of protons), but a different number of neutrons. Used in a variety of oceanic applications such as dating andmovement of water masses. 2018-03-07 10:07:42.0