Tohoku University

Tokuyama Corporation

Yutaka Fujimoto

Akira Yoshikawa

Kentaro Fukuda

Takayuki Yanagida

Noriaki Kawaguchi

Yui Yokota

Sumito Ishizu

Hisanori Yamane

Tetsuya Kawano

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.

Metal fluoride crystal, light emitting element, scintillator, method of detecting neutron, and method of producing metal fluoride crystal

[Problems to be Solved] A neutron scintillator excellent in detection efficiency for neutrons, an S/N ratio, and n/&#x3b3; 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 CaSrF(where x denotes a number greater than 0, but not larger than 1), such as SrFor CaSrF, 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.

Metal fluoride eutectic, neutron scintillator and neutron imaging device

[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 &#x3b3; 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 LiMMX, such as LiCaAlF, 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 ofLi of 20 mol % or more, preferably 50 mol % or more; a scintillator for neutron detection comprising the colquiriite-type crystal; and a neutron detector.

Colquiriite-type crystal, scintillator for neutron detection and neutron detector

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 &#x3b3;-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.

Scintillator for neutrons and neutron detector

[Problems to be Solved] A neutron scintillator excellent in neutron detection efficiency and n/&#x3b3; 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.

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Sendai, Japan

Yutaka Fujimoto