It is the single frequency at which a particle of a specific element will
assume a spiral trajectory within a high energy accelerator. It is
proportional to the generated magnetic field strength.
When these frequencies are calculated for the far lower terrestrial levels
of magnetism, they typically fall into the ELF-audio range. One well
documented example, by Dr. Ross Adey, is inter-cellular calcium ion
migration in brain tissue induced by 6.9 Hz.
My meaning was that, as the terrestrial field intensity varies from place
to place, the effective frequency would need to be adjusted relative to the
therapeutic application you previously described.
Peter Nielsen