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The hyperfine separation of tritium has been measured with respect to the hyperfine separation of hydrogen by comparing the frequency of the tritium maser with that of a hydrogen maser. The result is Δν(T)=1516701470.8087±0.0071 Hz, where it is assumed that Δν(H)=1420405751.8 Hz. Wall shifts were measured for tritium and hydrogen for FEP Teflon at 35^∘{}C. For a spherical bulb, d cm in diameter, the fractional wall shift for hydrogen is -(3.61±0.54)×10^-10d, and for tritium it is -(3.14±0.47)×10^-10d.
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Mathur et al. (1967) studied this question.
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