The dynamical behavior of the radical pair (RP) produced in the photoreduction of anthraquinone in sodium dodecyl sulfate (SDS) micellar solutions has been observed at various temperatures and salt concentrations by using the pulse-mode product-yield-detected ESR (PYESR) technique. Through the numerical calculation of the time-domain PYESR response by the Runge-Kutta method applied to a reaction scheme, dynamical parameters such as the escape rate of the RP (k(ESC)) and the rate of spin trapping directly from the RP (k(ST)) have been obtained. Since these kinetic parameters are very informative for elucidating the micelle dynamics, we may call this method the "spin-pair-probe" technique.