Per meg

Unit in isotope analysis

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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
[edit ]

^ http://scrippso2.ucsd.edu/units-and-terms

^ "Per Meg, Anyone? Picarro's New Isotopic Water Analyzer Achieves per Meg Precision | Picarro". Archived from the original on 2016年08月17日. Retrieved 2016年08月12日.

^ http://132.239.121.69/publications/ralph/3_Seasonal.pdf ^{[bare URL PDF ]}

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