  The possibility of the precise measurement of the electron beam energy using
absorption of radiation by electrons in a static and homogeneous magnetic field
in a range up to a few hundred GeV energies, was considered in [1]. With the
purpose of experimental checking of this method in a range of several tens MeV
energies, the possibility of measurement of absolute energy of the electron
beam energy with relative accuracy up to 10^{-4} is examined in details.
