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The results of the calculations of coordinate resolution and hadron rejectionfactor for a simple e/gamma detector consisting of a lead convertor followed bya hodoscope are presented. For the simulation of showers, initiated in theconverter by electrons and hadrons with energies upto 1 TeV GEANT4 is used. Itis shown that the best coordinate resolution for electrons is achieved when theconverter thickness is closed to the shower maximum. For example, at 200 GeVwith 2 mm strip width hodoscope it is equal to sigma=89 microns provided a"truncated mean" coordinate estimation is used. The optimal thickness of theconverter for hadron rejection is also close to tmax. For 200 GeV beam ofelectrons and protons the rejection factor of 10^-4 for 0.9 electron detectionefficiency can be reached using only data on charged particles multiplicities.Information on the spatial distribution of the shower particles after theconverter allows to enhance further the rejection by several times.

Properties of a simple e/gamma detector consisting of a lead convertor and a hodoscope