원래 이름 기록: NITERRA MATERIALS CO., LTD.

A ceramic substrate according to an embodiment has a first surface as a front surface and a second surface as a back surface, when a midpoint of a line segment connecting a central portion Pof the first surface and a central portion Pof the second surface is defined as a midpoint portion C, an amount of a component of a release agent measured at the central portion Pof the first surface or the central portion Pof the second surface is five times or more an amount of the component of the release agent measured at the midpoint portion C. A ratio P/Pbetween the amount of the component of the release agent measured at the central portion Pand the amount of the component of the release agent measured at the central portion Ppreferably satisfies 0.5≤P/P≤2.

A granulated particle for cold storage material particle according to an embodiment includes a rare earth oxysulfide or a rare earth oxide containing at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, in which the granulated particle has a plurality of recesses each having a closed curve at an outer edge on a surface thereof.

According to one embodiment, a tungsten wire including a tungsten alloy containing rhenium, wherein, according to an EBSD analysis on a unit area of 40 μm× 40 μm in a central portion located within 100 μm concentrically extending from a central axis in a cross section along a wire radial direction perpendicular to a wire drawing direction in a main body portion of the tungsten wire, an area ratio accounted for by crystal orientations having an orientation difference of 15 degrees or less from <101>, which is parallel to the wire drawing direction, to a measurement field is 90% or more and 99.9% or less on an IPF map.

According to one embodiment, a tungsten alloy includes rhenium. A standard deviation of a rhenium concentration based on point analysis by scanning electron microscope/energy dispersive X-ray spectroscopy at arbitrary six points on an arbitrary cross section is 1.0 wt or less.

A decrease and variations in dimensional accuracy due to deformation is suppressed. The scintillator array according to an embodiment includes a plurality of scintillator segments each including a sintered body of a rare earth oxysulfide phosphor, a first reflective layer interposed between adjacent scintillator segments so as to integrate the scintillator segments, and a second reflective layer located on a surface side of the scintillator segments on which X-rays are incident. The amount of deformation of the corners of the second reflective layer is 20 μm or smaller.

A cold storage material according to an embodiment contains a rare earth aluminum oxide containing at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, in which a Group 1 element is contained in an amount of 0.001 atom % or more and 10 atom % or less, and a maximum volumetric specific heat value in a temperature range of 2 K or more and 10 K or less is 0.5 J/(cm·K) or more.