Abstract: A neutron detector circuit for a neutron detector is disclosed that includes a scintillator having a plurality of wavelength shifting optical fibers. A first detection circuit is connected with a first PMT output that is configured to generate a first detection circuit output in response to a first neutron event. A second detection circuit is connected with a second PMT output that is configured to generate a second detection circuit output in response to a second neutron event. A coincidence detection circuit is included that has inputs connected with the first and second detection circuit outputs that is configured to generate a neutron event count output pulse in response to coincident signals being received by the coincidence detection circuit from the first and second detection circuit outputs.

Abstract: A neutron detector is disclosed that includes a generally elongate sealed housing. A scintillator based neutron detection assembly is positioned within the elongate housing. The scintillator based neutron detection assembly includes a reflective portion, a plurality of optical fibers, and a scintillator portion. A fiber guide is connected with an end of said scintillator based neutron detection assembly and an end of the at least one bundle of fibers from the plurality of optical fibers is positioned in an output port in the fiber guide. A sensor assembly is included and is connected with the end of the bundle of fibers. An output connector is located on a front end of the generally elongate sealed housing for transmitting an output voltage in response to a neutron event.

Abstract: A neutron detector circuit for a neutron detector is disclosed that includes a scintillator having a plurality of wavelength shifting optical fibers. A first detection circuit is connected with a first PMT output that is configured to generate a first detection circuit output in response to a first neutron event. A second detection circuit is connected with a second PMT output that is configured to generate a second detection circuit output in response to a second neutron event. A coincidence detection circuit is included that has inputs connected with the first and second detection circuit outputs that is configured to generate a neutron event count output pulse in response to coincident signals being received by the coincidence detection circuit from the first and second detection circuit outputs.

Abstract: A neutron detector is disclosed that includes a generally elongate sealed housing. A scintillator based neutron detection assembly is positioned within the elongate housing. The scintillator based neutron detection assembly includes a reflective portion, a plurality of optical fibers, and a scintillator portion. A fiber guide is connected with an end of said scintillator based neutron detection assembly and an end of the at least one bundle of fibers from the plurality of optical fibers is positioned in an output port in the fiber guide. A sensor assembly is included and is connected with the end of the bundle of fibers. An output connector is located on a front end of the generally elongate sealed housing for transmitting an output voltage in response to a neutron event.