CRYSTALLINE MATERIAL, RADIATION DETECTOR, IMAGE PICK-UP DEVICE, NON-DESTRUCTIVE INSPECTION DEVICE

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Disclosed is a crystal material represented by a general formula (1) : (Gd1-x-y-zLaxMEyREz)2 (Si1-vMMv)2O7 (1), where ME is at least one selected from Y, Yb, Sc, and Lu; RE is a transition metal or rare earth element; MM is at least one selected from Ge, Sn, Hf, and Zr; and ranges of x, y, z, and v are represented by the following (i) or (ii) : (i) 0.05 ≤ x + z ≤ 1.0, 0.0 ≤ y ≤ 1.0, 0.0001 ≤ z < 0.05, and v = 0.0 (where, when RE is Ce, y = 0 is an exception) or (ii) 0.0 ≤ x + y + z ≤ 1.0, 0.0001 ≤ z ≤ 0.05, and 0.0 < v. This configuration provides a crystal material having a large light emission amount and a short fluorescence lifetime and a radiation detector, an imaging apparatus, a nondestructive inspection apparatus, and a lighting apparatus containing the crystal material.