This invention provides a scintillator material that comprises either a light-transmitting ceramic consisting primarily of a complex oxide that can be represented by formula (1) or a single crystal of such a complex oxide. When excited by X-rays and/or gamma rays, said scintillator material emits scintillation light having a peak emission wavelength that is further towards the long-wavelength end of the visible-light region than the peak emission wavelengths of existing scintillator materials. This scintillator material also has a high transmittance with respect to the aforementioned scintillation light, has a short decay time, and can be manufactured by heat-treating, at a temperature less than or equal to 1,800 DEG C, a complex oxide having a comparatively simple composition, reducing manufacturing costs. (1) (TbxR1-x-yCey)2B2O7 (In formula (1), 0.2 &le x < 1, 0.00001 &le y &le 0.01, and x+y &le 1 R represents one or more rare earth elements selected from among the group consisting of yttrium, gadolinium, lutetium, lanthanum, holmium, thulium, europium, dysprosium, and praseodymium and B represents one or more elements selected from among the group consisting of titanium, tin, hafnium, silicon, germanium, and zircon (but not silicon only or germanium only).)本發明提供一種閃爍體材料,其係由包含以下述式(1)表示之複合氧化物作為主成分之透光性陶瓷或以下述式(1)表示之複合氧化物之單結晶所成,且藉由X射線及/或伽瑪射線之激發而發出於比以往更為長波長側之可見光區域中具有發光峰值波長之閃爍光,且該閃爍光之透過率高,且衰減時間亦短,可藉由1800℃以下之熱處理製造較單純組成之複合氧化物而可抑制製造成本。(TbxR1-x-yCey)2B2O7 (1)(式中,x為0.2以上且未達1之範圍,y為0.00001以上且0.01以下之範圍,x+y≦1,R係選自由Y、Gd、Lu、La、Ho、Tm、Eu、Dy、Pr所組成之群之至少1種稀土類元素,B係選自由Ti、Sn、Hf、Si、Ge、Zr所組成之群之至少1種元素(但,關於Si及Ge為該元素單獨之情況除外))。10‧‧‧放射線檢測器11‧‧‧閃爍體板12‧‧‧反射材13‧‧‧受光元件14‧‧‧容器
