| 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/γ discrimination ability; and a metal fluoride crystal suitable for the neutron scintillator. n [Means to Solve the Problems] A metal fluoride crystal, as a parent crystal, represented by the chemical formula LiM 1 M 2 F 6 (where M 1 represents at least one alkaline earth metal element selected from the group consisting of Mg, Ca, Sr and Ba, and M 2 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. |