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A new plate-like tissue equivalent proportional counter (TEPC) based on the gas electron multiplier (GEM) is being developed for use as a neutron rem meter. The advantage of a plate-like TEPC over a conventional spherical TEPC is that several of the plate-like TEPCs can be stacked together as one unit to increase sensitivity to neutrons. A GEM-based TEPC consists of four layers of materials in a series: the front cover made of polyethylene, the cathode made of A-150 plastic, the gas region containing 1/3 atm of P-10 and 1/3 atm of nitrogen and the anode made of a copper-coated printed circuit board. The dimensions of the TEPC are 10 cm × 10 cm × 1.8 cm. The computer simulation shows that the neutron response function of the TEPC closely resembles the response curve of  H *(10) for neutrons with energies between 0.25 eV and 10 MeV. The corresponding sensitivity for such a TEPC for a bare  252 Cf neutron source was calculated to be 5.0 cpm per μSv h −1 . This sensitivity can be increased many times by simply stacking several TEPCs together as one unit.

Design and simulation of a GEM-based TEPC as a neutron REM meter