Abstract: A neutron detector with a unique neutron detecting element is disclosed. The neutron detecting element has an inner cylindrical neutron scintillator where a neutron detection body including a ZnS phosphor, and a neutron converter material which contains 6Li or 10B is arranged outside of the cylindrical substrate; a scintillator fluorescence detection body made by placing coiled wavelength shift fibers where two wavelength shift fibers are wound in parallel along the cylindrical substrate on said inner cylindrical neutron scintillator; and an outer cylindrical neutron scintillator where a neutron detection body is arranged inside of the cylindrical substrate, the outer cylindrical neutron scintillator being arranged on the scintillator fluorescence detection body. The fluorescence signals converted into pulse signals by two optical detectors are led to a coincidence circuit, and when two fluorescence signals are measured simultaneously during the predetermined period of time, a neutron signal is output.

Abstract: A neutron detector with a unique neutron detecting element is disclosed. The neutron detecting element has an inner cylindrical neutron scintillator where a neutron detection body including a ZnS phosphor, and a neutron converter material which contains 6Li or 10B is arranged outside of the cylindrical substrate; a scintillator fluorescence detection body made by placing coiled wavelength shift fibers where two wavelength shift fibers are wound in parallel along the cylindrical substrate on said inner cylindrical neutron scintillator; and an outer cylindrical neutron scintillator where a neutron detection body is arranged inside of the cylindrical substrate, the outer cylindrical neutron scintillator being arranged on the scintillator fluorescence detection body. The fluorescence signals converted into pulse signals by two optical detectors are led to a coincidence circuit, and when two fluorescence signals are measured simultaneously during the predetermined period of time, a neutron signal is output.

Abstract: In a lattice-like pixel structure in which reflecting plates that reflect a fluorescent light from a fluorescent material-based neutron detecting sheet are arranged along vertical and horizontal axes at a regular interval, a lattice-like fluorescent light detecting member is provided, in which grooves may be formed at an upper half position of the vertical axis direction reflecting plate and at a center position in a vertical axis interval for accommodating a wavelength shifting fiber for vertical axis detection and at a lower half position of the horizontal axis direction reflecting plate and at a center position in a horizontal axis interval for accommodating a wavelength shifting fiber for horizontal axis detection; and a fluorescent material-based neutron detecting sheet is arranged only at a front surface or at both of a front surface and a back surface of the lattice-like fluorescent light detecting member.

Abstract: A neutron detector without 3He gas, provided with a translucent type plate neutron scintillator having the structure capable to emit fluorescence from double-sides; the neutron scintillator is composed of ZnS fluorescent substance and a neutron converter which contains 6Li or 10B, and arranged at an angle of 45 degrees from the neutrons which are incident in parallel all together, inside of a cylindrical detector housing with the circular or square section where the specular reflector with the reflectance of 90% or more is arranged internally, and the fluorescence emitted when the neutron enters the scintillator is detected by two photo multipliers arranged on both sides, and signals output from these two photo multipliers are processed to be taken out as a neutron signal.

Abstract: A neutron detector without 3He gas, provided with a translucent type plate neutron scintillator having the structure capable to emit fluorescence from double-sides; the neutron scintillator is composed of ZnS fluorescent substance and a neutron converter which contains 6Li or 10B, and arranged at an angle of 45 degrees from the neutrons which are incident in parallel all together, inside of a cylindrical detector housing with the circular or square section where the specular reflector with the reflectance of 90% or more is arranged internally, and the fluorescence emitted when the neutron enters the scintillator is detected by two photo multipliers arranged on both sides, and signals output from these two photo multipliers are processed to be taken out as a neutron signal.

Abstract: In a lattice-like pixel structure in which a reflecting plate that reflects a fluorescent light from a fluorescent material-based neutron detecting sheet is arranged along a vertical axis at a regular interval, and a reflecting plate that reflects a fluorescent light is arranged along a horizontal axis at a regular interval and at a right angle with respect to a series of fluorescent plates formed arranged along the vertical axis, a lattice-like fluorescent light detecting member is formed by providing such a structure that a groove may be formed at upper half position of the vertical axis direction reflecting plate and at a center position in a vertical axis interval for accommodating a wavelength shifting fiber for vertical axis detection for detecting the fluorescent light, and a groove may be formed at lower half position of the horizontal axis direction reflecting plate and at a center position in a horizontal axis interval for accommodating a wavelength shifting fiber for horizontal axis detection for d