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医用闪烁陶瓷钆镓铝石榴石CeGGAG的制备及其性能研究

时间:2018-12-30 15:05来源:毕业论文
对掺杂铈离子的钆镓铝石榴石(Ce: GGAG)闪烁体材料的制备工艺和光学性能进行了研究,探究了Ce: GGAG闪烁陶瓷的闪烁性能。发现Ce: GGAG 闪烁陶瓷光产额达34400 ph/MeV

摘  要:闪烁材料是一种将吸收的高能粒子或者高能射线的能量转换成可见光的发光材料。它可与常用的光电探测器如光电倍增管(PMT)耦合,其在医学快速成像方面得到应用广泛。立方结构的钆镓铝石榴石(Gd3(Ga,Al)5O12,GGAG)具有密度大、透过率高、光差额高、衰减速度快、余辉少等特点,是极具前景的闪烁体材料之一。本论文主要对掺杂铈离子的钆镓铝石榴石(Ce: GGAG)闪烁体材料的制备工艺和光学性能进行了研究,其研究内容和结论如下:
(1)采用固相反应的方法制备出Ce: GGAG闪烁陶瓷,通过改变烧结温度探究其对陶瓷致密化程度的影响。实验发现,当烧结温度大于1470℃时陶瓷基本达到致密化。
(2)探究在热等静压(HIP)温度为1350℃气压为200MPa时HIP对不同致密化程度的陶瓷性能影响。实验发现,HIP以后陶瓷都达到了理论透过率6.65g/cm3,致密化程度越低的陶瓷HIP后透过率越高。32035
(3)探究了Ce: GGAG闪烁陶瓷的闪烁性能。发现Ce: GGAG 闪烁陶瓷光产额达34400 ph/MeV,衰减时间仅为19.13ns。
毕业论文关键词:闪烁陶瓷  热等静压  固相反应  Ce:GGAG
 The Preparation and Performance of the Medical Ce:GGAG Scintillator Ceramic
Abstract:Scintillation material, which is a kind of luminescent materials, can emit visible photons by absorbing the energy of energetic particle or ray. It is widely used in fast medical imaging when coupled with the frequently-used photo-electric detector such as photomultiplier tube (PMT). The characteristics of high density, high transmittance, high light balance, less attenuation speed and persistence of the cubic-structure aluminum gadolinium gallium garnet(Gd3(Ga,Al)5O12,GGAG) make the GGAG one of the promising scintillation material. In this paper, the preparation and optical properties of the cerium-doped GGAG (Ce:GGAG) scintillator material were studied. The contents and conclusions are as follows:
源`自*六)维[论*文'网www.lwfree.cn

(1) In the preparation of the Ce: GGAG scintillation ceramic, the method of solid phase reaction by changing the sintering temperature to explore their effects on ceramic densification degree was adopted. We found that the ceramics reached densification when the sintering temperature was greater than 1470℃.
(2) The effect of the hot isotactic pressing (HIP) temperature on the densification degree of the ceramic performance when the hot isotactic pressing (HIP) temperature was 1350℃ and the pressure was 200 Mpa were researched. The experiments found that the ceramics densification reached the theory of transmittance, 6.65 g/cm3 after HIP. In addition, a lower densification degree of the ceramic made the transmittance of the ceramic to be higher after HIP.
(3) The scintillation properties of Ce: GGAG ceramics was explored. We found that the light yield and the decay time of the Ce: GGAG ceramic were 34400 ph/MeV and 19.13ns, respectively.
Key words:Scintillation ceramics  HIP  Solid-state reaction  Ce:GGAG
目  录
1 绪论    1
1.1 引言    1
1.2 闪烁材料的基本原理    1
1.3 闪烁材料的基本特性    3
1.4 闪烁材料的研究进展    6
1.5 GGAG闪烁陶瓷    8
1.6 本论文的选题依据、研究内容和研究思路    8
1.6.1 选题依据    8
1.6.2 本论文的研究内容    8
1.6.3 本论文的研究思路    9
2 样品的制备    11
2.1实验原料    12
2.2 粉体的制备过程    12
2.3粉体的成型与烧结    12
3 性能表征与测试方法    15
3.1 密度测定    15
3.2 XRD(X-ray Diffraction)物相分析    15 医用闪烁陶瓷钆镓铝石榴石CeGGAG的制备及其性能研究:http://www.lwfree.cn/wuli/20181230/28425.html
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