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Here, a theory of the intensity and concentration dependent damping ofnutation signals observed by Boscaino et al. (Phys. Rev B 48, 7077 (1993);Phys. Rev. A 59, 4087 (1999)) and by others in various two-level spin systemsis proposed. It is shown that in diluted paramagnetic solids contribution ofdipole-dipole interaction to the nutation decay is negligibly small. Weelaborated a cavity loss (radiation damping) mechanism that explains theintensity- and concentration dependence of the damping. It is shown thatinstead of ordinary Bloch's transverse T2 and longitudinal T1 dampingparameters the decay of transverse and longitudinal spin components in nutationprocess are described by one and the same intensity-, concentration-,frequency- and time dependent damping parameter.

Transient nutations decay in diluted paramagnetic solids: a radiation damping mechanism