US Geological Survey
The Reston Chlorofluorocarbon Laboratory
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Dissolved Gas N
2
/Ar
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SF
6
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SF
5
CF
3
/ CFC-13
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3
H/
3
He
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Dissolved Gas N
2
/Ar Analysis
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Helium-4 analysis now available
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N
2
, Ar, CO
2
, CH
4
, O
2
instrument in use by the US Geological Survey