(Table 2) Noble gas isotopic ratios from the Antrim Shale in the Michigan Basin
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R/Ra = R is the measured 3He/4He ratio and Ra is the atmospheric value of 1.384 ± 0.013 × 10**-6.
R/Ra 中，R为实测的氦-3与氦-4（3He/4He）的比值，Ra为大气基准值，其数值为1.384 ± 0.013 × 10⁻⁶。
