COLQUIRIITE-TYPE CRYSTAL, SCINTILLATOR FOR NEUTRON DETECTION, AND NEUTRON RADIATION DETECTOR

摘要

[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 ³ 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 LiM 1 M 2 X 6 , such as LiCaAlF 6 , 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 6 Li of 20 mol% or more, preferably 50 mol% or more; a scintillator for neutron detection comprising the colquiriite-type crystal; and a neutron detector.