The spin relaxation rates of free radicals in solution can provide valuable information about the dynamics of molecular tumbling in solution, and solvent-radical interactions. The dominant relaxation mechanism and information about reorientation rates can be determined from the temperature and viscosity dependence of the T1(muon) spin relaxation time. We are proposing to measure the muon T1 relaxation time for transient small and biologically relevant alpha-hydroxyalkyl radicals in aqueous solution as a function of temperature and applied magnetic field. The results of these experiments will be compared with studies of corresponding muoniated radicals in other solvents in order to learn about solvent effects and with the non-muoniated equivalents in aqueous solution to learn about isotope effects.