  An algorithm for numerical computation of the barrier transparency for the
potentials surrounding Schwarzschild black holes is described for massive
spinor particles. It is then applied to calculate the total (including
electronic neutrino and the contributions of twisted field configurations
connected with Dirac monopoles) luminosity for the electron-positron Hawking
radiation from a Schwarzschild black hole with mass $M=10^{15}$ g. It is found
that the contribution due to monopoles can be of order 12% of the total
electron-positron luminosity.
