The invention relates to an inorganic scintillator material of formula Lu(2−y)Y(y−z−x)CexMzSi(1−v)M′vO5, in which:M represents a divalent alkaline earth metal and M′ represents a trivalent metal, (z+v) being greater than or equal to 0.0001 and less than or equal to 0.2,z being greater than or equal to 0 and less than or equal to 0.2;v being greater than or equal to 0 and less than or equal to 0.2,x being greater than or equal to 0.0001 and less than 0.1; andy ranging from (x+z) to 1.In particular, this material may equip scintillation detectors for applications in industry, for the medical field (scanners) and / or for detection in oil drilling, The presence of Ca in the crystal reduces the afterglow, while stopping power for high-energy radiation remains high.