https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.6 2026-03-19T10:41:57.720Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/a81f6b17-2a16-4600-84b6-bcbcc5c29d2f 2021-02-26 ATMOSPHERIC RADON Date=2021-03-04 User Id=tstevens Entity=Definition Operation=INSERT System Note=insert Definition New Value=id: null text: Radon is a chemical element with the symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas. It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead and various other short-lived radioactive elements. Radon itself is the immediate decay product of radium. language code: en Date=2021-02-26 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Insert Concept System Note=add broader relation New Value=ATMOSPHERIC RADON [a81f6b17-2a16-4600-84b6-bcbcc5c29d2f,560877] - NOBLE GAS [18d9ddbb-66cc-4b92-aa8d-2395ab3a17ce,560876] Date=2021-02-26 User Id=tstevens Entity=NarrowerRelation Operation=INSERT User Note=Insert Concept System Note=add narrower relation New Value=ATMOSPHERIC RADON [a81f6b17-2a16-4600-84b6-bcbcc5c29d2f,560877] - RADON PROFILES [0857df34-93ca-4c8e-a909-3621ea1dcbe7,560878] Date=2021-02-26 User Id=tstevens Entity=NarrowerRelation Operation=INSERT User Note=Insert Concept System Note=add narrower relation New Value=ATMOSPHERIC RADON [a81f6b17-2a16-4600-84b6-bcbcc5c29d2f,560877] - RADON SURFACE [7b6f32f2-7123-488b-9c9b-98acdc0c6f5a,560879] Radon is a chemical element with the symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas. It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead and various other short-lived radioactive elements. Radon itself is the immediate decay product of radium. 2021-03-04 09:03:34.0