In the Hero Isotope system, 311.8 Hz corresponds to rubidium isotope (half-life 4.8 × 10¹¹ years). Auriviel tunes audio to this fundamental as a contemplative listening experience. It is offered as music, not as medical treatment. Independent of any tradition, controlled clinical evidence that a specific frequency produces a specific health effect is limited and mixed. Auriviel presents these tunings as music and contemplative practice. This page is for general information and relaxation. Auriviel's frequency music is not medical advice, diagnosis, or treatment, and no health outcome is claimed. If you have a medical concern, please consult a qualified professional.