  The results of calibration by cosmic muons of a shower lead-scintillation
spectrometer of the sandwich type designed to work in high-intensity photon and
electron beams with an energy of 0.1 - 1.0 GeV are presented. It was found that
the relative energy resolution of the spectrometer depends on the angle of
entry of cosmic muons into the spectrometer in the vertical plane and does not
depend on the angle of entry in the horizontal plane. The relative energy
resolution of the spectrometer was 16%. Placing an additional
lead-scintillation assembly in front of the spectrometer improved the relative
energy resolution of the spectrometer to 9%.
