Since the Gas Electron Multiplier (GEM) was introduced, it has been developed in many application areas. We have developed a cascade GEM for a neutron detector. The neutron efficiency of a converting foil was calculated with Monte Carlo N-particle (MCNP) and transport of ions in matter (TRIM). The neutron efficiency of multi GEMs was also calculated. The boron compound was coated onto the drift plate, and the neutron was measured with a gas chamber installed with a GEM. The stabilization process of a boron coating onto a GEM foil has been developed at the Korea Atomic Energy Research Institute.
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