一种新型CaF_2:Gd纳米材料的制备及其热释光性能  

Preparation and thermoluminescence properties of a novel CaF_2:Gd nanomaterials

作　　者：张泽群[1] 胡晓丹[1] 张伟[1] 刘国财[1] 于书悦 张海黔[1] 

机构地区：[1]南京航空航天大学核科学与工程系,南京211106

出　　处：《辐射研究与辐射工艺学报》2016年第6期51-57,共7页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金资助项目(11575086);江苏省自然科学基金资助项目(BK20131355);江苏高校优势学科建设工程资助项目~~

摘　　要：用水热法制备钆掺杂的氟化钙（CaF2：Gd）纳米材料。采用x射线衍射、扫描电子显微镜、能谱仪等方法对其进行表征，发现CaF2：Gd材料样品平均粒径44am，晶体呈立方晶系结构，样品组成元素为Ca、F、Gd。运用Tm-Tstop与CGCD（ComputerizedGlowCurvesDe—convolved）相结合的方法对发光曲线进行解谱，确定材料发光曲线的4个重叠峰分别为126、148、174、286℃，并得到了各发光峰的动力学参数。结果表明，制备的CaF2：Gd纳米材料对于Y射线在1～10000Gy内都有良好的线性剂量响应，兼顾良好的重复性和衰减性，稀土元素Gd的最优掺杂物质的量浓度为0．6％。制备的CaF2：Gd纳米材料可以用作高剂量γ射线测量。Gadolinium doped calcium fluoride （CaF2：Gd） nanoparticles were prepared by the hytrothermal method. X-ray diffraction （XRD）, Scanning electron microscope （SEM）, and Energy dispersive spectrometer （EDS） were used to characterize the nanomaterials and obtained the 44 nm average particle size, the cubic crystal and element compose （Ca, F, Gd）. The combination of Tm-Tstop and CGCD （Computerized glow curves de-convolved） were used and four overlapping peaks were found in glow curve at 126, 148, 174 and 286 ℃. And the kinetic parameters of the synthesized nanomaterials were a/so obtained. The optimal Gd mole percent was found at 0.6%. A good linear dose response was shown from 1 Gy to 10 000 Gy. The fading and repeatability of the nanoparticles were also excellent. It can be concluded that the CaF2：Gd nanomaterials could be employed to measure the high dose gamma radiation.

关 键 词：热释光 水热 Gd掺杂CaF2 纳米材料 

分 类 号：TL818[核科学技术—核技术及应用]