The effects of radiation dose rate concentration of emulsifier and monomer content on reaction rate of radiation induced 2-ethylhexyl acrylate (EHA) emulsion polymerization have been studied. Nonionic surfactants, polyoxyethylene alkylether peregolo 0 with HLB about 15 and polyoxyethylene nonylphenolether (emulsifier OP)with HLB 15, are used as the emulsifiers in this work. It has been found that the dependence of R,p, on I (R,p,∝I,n,) is changed with the index n from 0.29 for M/W= 2/8 (monomer/water in volume) to 0.91 for 5/5, where[E] of peregolo 0 is 4%. It has also been found that R,p,∞[E],0.58, for peregolo 0 and R,p,∞[E],0.51, for emulsifier OP. In order to interpret the results sufficiently, both micellar nucleation and microdroplet nucleation have been taken into account for the emulsion polymerization of the present system irradiated without agitation, especially for the case with a higher M/W value the later may be the main nucleation process.