https://mriquestions.com/who-was-larmor.html Larmor's Hydrogen frequency is stated as 42.58 MHz.
No, it is stated as 42.58 MHz/Tesla. In your question you seem to assume that the Larmor precession frequency it constant * for an isotope. It is not - it depends on the magnetic flux density (B) that the nucleus is subjected to. For example at 2T the hydrogen's nucleus will precess with the frequency of 85.16MHz ...and at 0T - 0Hz. Because of this dependency your question about a particular frequency of a particular isotope is ambiguous, as it is missing the critical parameter (B). The good news is that the gyromagnetic ratio is constant for an isotope barring chemical shifts. *because you are citing particular frequencies with units of frequency such as MHz and kHz.
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