Abstract: An unauthorized communication detection device that detects unauthorized communication in a manufacturing system that manufactures products includes: an obtainer that obtains operation information of the manufacturing system; a storage that stores element information indicating one or more target elements among a plurality of elements related to manufacturing of the products; a specifier that specifies, for each of a plurality of communications performed in the manufacturing system, an element corresponding to the communication, based on the operation information; a calculator that calculates an abnormal degree of each of one or more communications, which satisfy that the element specified by the specifier is included in the one or more target elements indicated by the element information, among the plurality of communications; and a determiner that determines that, when an abnormal degree calculated by the calculator is larger than a threshold value, a communication corresponding to the abnormal degree is th

Abstract: A ceramic scintillator according to the present embodiment has a composition represented by (Lu1-xPrx) a (Al1-yGay) bO12, wherein x, y, a, and b in the composition respectively satisfy 0.005?x?0.025, 0.3?y?0.7, 2.8?a?3.1, and 4.8?b?5.2.

Abstract: The present invention aims at providing a scintillator for high temperature environments which has satisfactory light emission characteristics under high temperature environments; and a method for measuring radiation under high temperature environments. The scintillator for high temperature environments comprises a colquiriite-type crystal represented by the chemical formula LiM1M2X6 (where M1 is at least one alkaline earth metal element selected from Mg, Ca, Sr and Ba, M2 is at least one metal element selected from Al, Ga and Sc, and X is at least one halogen element selected from F, Cl, Br and I), for example, typified by LiCaAlF6, and the crystal optionally containing a lanthanoid element such as Ce or Eu. The method for measuring radiation under high temperature environments uses the scintillator.

Abstract: A neutron scintillator composed of a resin composition comprising (A) an inorganic phosphor containing at least one neutron capture isotope selected from lithium 6 and boron 10 and (B) a resin, wherein the inorganic phosphor is a particle having a specific surface area of 50 to 3,000 cm2/cm3, and the internal transmittance based on 1 cm of the optical path length of the resin composition is 30%/cm or more at the emission wavelength of the inorganic phosphor.

Abstract: A light emitting element according to one embodiment of the present invention is configured of a metal fluoride crystal which is represented by chemical formula LiM1M2F6 (wherein Li includes 6Li; M1 represents at least one alkaline earth metal element selected from among Mg, Ca, Sr and Ba; and M2 represents at least one metal element selected from among Al, Ga and Sc), said metal fluoride crystal containing 0.02% by mole or more of Eu and having an Eu2+ concentration of less than 0.01% by mole.

Abstract: A neutron scintillator composed of a resin composition comprising (A) an inorganic phosphor containing at least one neutron capture isotope selected from lithium 6 and boron 10 and (B) a resin, wherein the inorganic phosphor is a particle having a specific surface area of 50 to 3,000 cm2/cm3, and the internal transmittance based on 1 cm of the optical path length of the resin composition is 30%/cm or more at the emission wavelength of the inorganic phosphor.

Abstract: [Problems to be Solved] A neutron scintillator excellent in detection efficiency for neutrons, an S/N ratio, and n/? discrimination ability, and a eutectic preferred for the neutron scintillator are provided. [Means to Solve the Problems] A metal fluoride eutectic, in which a lithium fluoride crystal phase and a crystal phase represented by the chemical formula Ca1-xSrxF2 (where x denotes a number greater than 0, but not larger than 1), such as SrF2 or Ca0.5Sr0.5F2, are present in a phase-separated state; a neutron scintillator comprising the eutectic; and a neutron imaging device comprising a combination of the neutron scintillator and a position-sensitive photomultiplier tube.

Abstract: A light emitting element according to one embodiment of the present invention is configured of a metal fluoride crystal which is represented by chemical formula LiM1M2F6 (wherein Li includes 6Li; M1 represents at least one alkaline earth metal element selected from among Mg, Ca, Sr and Ba; and M2 represents at least one metal element selected from among Al, Ga and Sc), said metal fluoride crystal containing 0.02% by mole or more of Eu and having an Eu2+ concentration of less than 0.01% by mole.

Abstract: Provided is a scintillation neutron detector capable of measuring neutrons with precision even under a high amount of ? rays as background noise and excellent in neutron counting precision, the scintillation neutron detector comprising a neutron scintillator crystal containing 6Li, and the crystal having a specific surface area of no less than 60 cm2/cm3.

Abstract: [Problems to be Solved] A colquiriite-type crystal preferred for a scintillator for neutron detection, which has high sensitivity to neutron and which is reduced in background noise attributed to ? rays; a scintillator for neutron detection which comprises this crystal; and a neutron detector are provided. [Means to Solve the Problems] A colquiriite-type crystal represented by the chemical formula LiM1M2X6, such as LiCaAlF6, containing Na and Ce, for example, the colquiriite-type crystal containing at least one alkali metal element selected from the group consisting of Na, K, Rb and Cs, and a lanthanoid element selected from the group consisting of Ce, Pr and Nd, and having an isotopic ratio of 6Li of 20 mol % or more, preferably 50 mol % or more; a scintillator for neutron detection comprising the colquiriite-type crystal; and a neutron detector.

Abstract: Provided is a scintillator for neutrons that allows the detection of neutrons with superb sensitivity and that is little affected by background noise derived from ?-rays, and a neutron detector that uses the neutron scintillator. The scintillator for neutrons comprises borate that contains at least Mg and a divalent transition element.

Abstract: [Problems to be Solved] A neutron scintillator excellent in neutron detection efficiency and n/? discrimination ability, and a metal fluoride eutectic preferred for the neutron scintillator are provided. [Means to Solve the Problems] A metal fluoride eutectic having a cerium-containing calcium fluoride crystal phase and a lithium fluoride crystal phase present in a phase-separated state, and a neutron scintillator comprising the metal fluoride eutectic.

Abstract: Provided is a radiation detector with improved n/? discrimination and usable even under high counting rate conditions with a reduced load on a signal-processing system. The detector capable of distinguishing neutron and gamma-ray events includes: a scintillator; an optical filter; a first photodetector to which a first part of light emitted from the scintillator is introduced via the optical filter; and a second photodetector to which a second part of light emitted from the scintillator is introduced not via the optical filter, wherein, for a set of two wavelengths A and (A+B) nm, the scintillator emits at least a light of A nm and a light of (A+B) nm when irradiated by gamma-ray, and emits a light of A nm and does not emit a light of (A+B) nm when irradiated by neutrons; and the optical filter blocks the light of A nm and transmits the light of (A+B) nm.

Abstract: [Problems to be Solved] A neutron scintillator excellent in neutron detection efficiency and n/? discrimination ability, and a neutron detector using the neutron scintillator are provided. [Means to Solve the Problems] A neutron scintillator comprising a eutectic body composed of laminar lithium fluoride crystals and laminar calcium fluoride crystals alternately arranged in layers, the thickness of the lithium fluoride crystal layers in the eutectic body being 0.1 to 5 ?m; or a neutron scintillator comprising a eutectic body composed of laminar lithium fluoride crystals and laminar calcium fluoride crystals alternately arranged in layers, the calcium fluoride crystal layers in the eutectic body being linearly continuous in at least one direction; and a neutron detector basically constructed from any of the neutron scintillators and a photodetector.

Abstract: The present invention aims at providing a scintillator for high temperature environments which has satisfactory light emission characteristics under high temperature environments; and a method for measuring radiation under high temperature environments. The scintillator for high temperature environments comprises a colquiriite-type crystal represented by the chemical formula LiM1M2X6 (where M1 is at least one alkaline earth metal element selected from Mg, Ca, Sr and Ba, M2 is at least one metal element selected from Al, Ga and Sc, and X is at least one halogen element selected from F, Cl, Br and I), for example, typified by LiCaAlF6, and the crystal optionally containing a lanthanoid element such as Ce or Eu. The method for measuring radiation under high temperature environments uses the scintillator.

Abstract: A novel scintillator for neutron detection is capable of increasing the probability of inducing a nuclear reaction using epithermal neutrons having higher energy than thermal neutrons as a result of increasing thickness in the direction of incidence of neutron radiation. A scintillator for neutron detection includes a colquiriite-type fluoride single crystal containing europium, containing 0.0025 mol % or more and less than 0.05 mol % europium, containing 0.80 atom/nm3 or more 6Li, and being shaped such that the thickness in the thickest part exceeds 1 mm.

Abstract: The present invention is a neutron detection device comprising a neutron detection scintillator composed of a colquiriite-type fluoride single crystal, and a silicon photodiode, characterized in that the single crystal contains only Eu as a lanthanoid and contains 0.80 atom/nm3 or more of 6Li, the content of Eu is 0.0025 to 0.05 mol %, and the thickness of the scintillator exceeds 1 mm. The present invention provides a neutron detection device which has a sufficiently high neutron detection efficiency, is equipped with a neutron detection unit minimally affected by gamma rays, and is compact as a whole and lightweight.

Abstract: Provided is a scintillator for neutrons that allows the detection of neutrons with superb sensitivity and that is little affected by background noise derived from ?-rays, and a neutron detector that uses the neutron scintillator. The scintillator for neutrons comprises borate that contains at least Mg and a divalent transition element.

Abstract: [Problems to be Solved] To provide a neutron scintillator which shows a large amount of luminescence in response to neutrons and which is excellent in neutron detection efficiency and n/? discrimination ability; and a metal fluoride crystal suitable for the neutron scintillator. [Means to Solve the Problems] A metal fluoride crystal, as a parent crystal, represented by the chemical formula LiM1M2F6 (where M1 represents at least one alkaline earth metal element selected from the group consisting of Mg, Ca, Sr and Ba, and M2 represents at least one metal element selected from the group consisting of Al, Ga and Sc), such as lithium calcium aluminum fluoride, lithium strontium aluminum fluoride, or lithium magnesium aluminum fluoride, the metal fluoride crystal containing at least one alkali metal element selected from the group consisting of Na, K, Rb and Cs, and also containing Eu; and a light-emitting device comprising the crystal, such as a neutron scintillator.

Abstract: A neutron radiation detector has a function that discriminates between neutron radiation and ? radiation based on a difference in pulse shape between photodetection signals from a neutron radiation detection scintillator, which includes a Ce-containing LiCaAlF6 single crystal.