Sentence:  In the present paper we deal with the second order radiative correction to the beta disintegration of nucleon, assuming the Fermi's interaction between necleon and <WSD>lepton</WSD> fields, and show that there appears such an ultraviolet divergence as can not be removed by the procedure of renormalization of mass and coupling constant, so far as a single type of coupling is assumed for the decay Hamiltonian. 
Meaning of the word marked with <WSD> tags:  An elementary particle that has a spin of 1/2 (i.e., is a fermion) and does not interact via the strong nuclear force; "examples include the electron, the muon, the neutrino and the tauon".