Abstract: A device for localizing neutrons is made up of modular elements placed within an enclosure which is transparent to neutrons and filled with a gas, each modular element being constituted by a series of parallel wire anodes, means for producing an electric field around each anode wire so as to give rise to charge multiplication when an electron penetrates into the field, a cathode placed in the proximity of the array of wire anodes, means for attaching the anode wires to the cathode walls and means for providing electrical insulation between the cathode and each anode wire.

Abstract: A security system for seismicly detecting intrusion into an enclosure. A plurality of sensor units are electrically connected in parallel across a two wire transmission line. The sensing elements are coupled to the line through high output impedence amplifiers to negate any signal attenuating shunt paths. The readout end of the line is closed through a characteristic impedence resistor to avoid signal reflections, and the remote end of the line is closed through relatively high resistors to avoid sensor signal absorption or attenuation.