The isotopic abundance of neon from helium-bearing natural gases

Xenon in CO2 well gas revisited

“…Enrichments of this magnitude have been observed in many 4He-bearing natural gases [Emerson et al, 1966; Shukolyukov et al, 1973]. The 2øNe/a•Ne ratios in terrestrial samples with positive a•Ne anomalies have values less than or equal to the value of atmospheric Ne [Wetherill, 1954;Emerson et al, 1966;Shukolyukov et al, 1973]. The a particles come presumably from those U and Th series elements which produced the radiogenic 4He in the well gas.…”

“…The latter is larger than the atmospheric value, but this enrichment is almost certairlly due to (a, n) reactions on •80 [Emerson et al, 1966;Wetherill, 1954], where the a particles are supplied by a emitters which produced the radiogenic 4He in the well gas [Zartman et al, 1961]. The latter is larger than the atmospheric value, but this enrichment is almost certairlly due to (a, n) reactions on •80 [Emerson et al, 1966;Wetherill, 1954], where the a particles are supplied by a emitters which produced the radiogenic 4He in the well gas [Zartman et al, 1961].…”

“…This result is not explicable in terms of a particle reactions. The 2øNe/a•Ne ratios in terrestrial samples with positive a•Ne anomalies have values less than or equal to the value of atmospheric Ne[Wetherill, 1954;Emerson et al, 1966;Shukolyukov et al, 1973]. We will return to this question in the Discussion section.Argon.…”

A determination of the Boltzmann constant from speed of sound measurements in helium at a single thermodynamic state

“…As discussed in sections 3.2 and 3.3, the microwave measurements on the assembled cavity showed a discrepancy between the shape of INRiM2 as regressed to the CMM data and its practical realization in the laboratory. In its experimental configuration, the shape of INRiM2 is apparently well approximated by an ellipsoid as defined by equation (58) in [50] with ε mw 1 = 0.000 35 and ε mw 2 = 0.000 30. For such simplified shape, the perturbation to the eigenvalues of the first nine radial acoustic modes (see table 6) varies from a minimum of 0.06 parts in 10 6 for mode (0,2) to 2.83 ppm for mode (0,10).…”

“…Upon direct enquiry, the manufacturer of our purchased helium sample confirmed that the list of target analytes considered to calculate the stated level of purity did not include noble gases. On the basis of the documented trace presence of neon in natural gas samples [58], the liquefaction procedures in the industrial preparation of our helium sample, and the only accurate analysis of a helium sample previously reported [28], we account for the possible presence of 0.5 ppm of neon in our helium sample, with a relative contribution to the uncertainty of k B of 2.0 ppm.…”