Per meg

Short description: Unit in isotope analysis

The phrase per meg indicates a fraction equal to 0.001 permil, or 0.0001 percent, or 1 part per million (ppm). It is typically used as a unit in isotope analysis, where multiplying an isotope ratio in delta annotation, for example δ18O, by 1000000 yields a value in per meg.[1][2] This notation is most frequently used in studies of atmospheric trace gases, where a high precision is needed for interpretation of the results. [3]

## References

1. ↑ "Units and Terms | Scripps O2 Program". http://scrippso2.ucsd.edu/units-and-terms.
2. ↑ "Per Meg, Anyone? Picarro's New Isotopic Water Analyzer Achieves per Meg Precision | Picarro". http://www.picarro.com/community/blog/per_meg_precision_for_isotopic_water_analysis.
3. ↑ "Seasonal and interannual variations in atmospheric oxygen and implications for the global carbon cycle". http://132.239.121.69/publications/ralph/3_Seasonal.pdf.

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