Abstract
This paper presents a modification of the metal gas electron multiplier (MGEM), free from one of the main drawback of this type of detectors namely the surface dielectric breakdown in the gap between the metal electrodes with holes. The high gas gain (104-105) with simple gas mixture or air offers the measurement for traces of alpha particles or high energy x-ray photon. It factor is very attractive for using of MGEM as background monitor of alpha particles or therapeutic beam counter.
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