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    Cadmium Tungstate Scintillation Crystal

    Cadmium tungstate (CdWO4, CWO) single crystal is an important scintillation materials applied in the radiation detection technology, especially for security checking , industrial CT and medical imaging. Large-size CWO single crystals with high quality were grown successfully by vertical Bridgman process in our company in recent years. CWO single crystal has a density as high as 7.9 g/cm-3 without any deliquescence. Under high-energy rays radiation such as X-rays or γ-rays, the crystal exhibits the luminescence output with a central wavelength of 470 nm. The crystal possesses a series of scintillation properties such as a relative light yield 2~3 times of BGO crystal, a low afterglow only 10-2 grade relative to CsI(Tl) crystal and a γ-ray radiation hardness of 107 rad. Our company provide the mass products of CWO wafers and array elements, which can meet the technical requirements for radiation detection devices.


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    Tab.  Materials properties of CWO single crystal

                                                                                     

    Crystal orientation

    <100>,<010>

    Crystal structure

    Monoclinic system,Space group P2/c

    Crystal lattice

    a = 5.029?,b = 5.859?,c = 5.074 ?;α = γ = 90o,β = 91.47o 

    Melting point

    1276oC

    Density

    7.90g/cm3

    Thermal expansion coefficient

    6.39×10-6 /K(<100>),1.09 × 10-5 /K(<010>)

    Refractive index

    2.3

    Hardness

    4.5 Mohs

    Cleavage

    (010)

    Colour

    Nearly colorless to pale yellowish brown 

    Deliquescence

    None

    Central wavelength of luminescence

    470 nm

    Relative light yield index

    20-30   (NaI(Tl) crystal with a light yield

     index 100 is used as reference)

    Absolute light yield

    2760 ± 50 p.e /MeV

    Energy resolution

    7.8-13%

    Luminescence decay time

    1.3 μs (36%, fast),11.5 μs (64%, slow) 

    Afterglow

    less than 0.04%@3 ms

    γ-ray radiation hardness

    107 rad




     

    Figures:

                                   

                             

                         Fig. 1  Ultroviolet-visible transmission spectra                                       Fig.2  X-ray stimulated luminescence spectra


                                 

                          

                      Fig. 3 Energy spectrum and light yield of CWO                      Fig. 4  Luminescence decay time of CWO wafer under UV excitation

                                    wafer under γ-ray excitation


                                   

                    

                         Fig. 5  Afterglow of CWO crystal less than 0.04%@3ms          Fig.6  Relative light yield uniformity of crystal array elements

                                    under γ-ray excitation  which only 10-2 grade 

                                    relative to CsI(Tl) crystal




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  • Povo é criador da história e verdadeiro herói, diz Xi 2019-05-20
  • 佛山:用公积金买装配式住房 贷款额度或可上浮20% ——凤凰网房产北京 2019-05-19
  • 拉美国家新闻官员与记者宁夏考察采访活动结束 2019-05-18
  • Lorgane législatif national adopte la loi sur la supervision 2019-05-18
  • 外国记者谈上海合作组织青岛峰会: 新希望 新征程 2019-05-17
  • 对毒跑道不能一铲了之 2019-05-17
  • ...重庆市政府公开信箱... 2019-05-16
  • 安徽省商务厅发布“安徽老字号”名单 68个品牌上榜 2019-05-16
  • 王杰的专栏作者中国国家地理网 2019-05-15
  • 机关党建工作巡礼——广东“走前头作表率” 2019-05-15
  • 因密封工艺控制不当 阿尔法罗密欧召回部分进口斯泰威汽车 2019-05-14
  • 人民网评:为改革创新撑腰,“为官不为”行不通了 2019-05-13
  • 老人惨遭3车辗轧元凶逃逸  松桃警方破获谜案抓住真凶 2019-05-13
  • 俄学者谈美国在南海制造紧张:正娴熟玩弄着阴谋 2019-05-12
  • [大笑]你这头猪看得懂逻辑? 2019-05-12
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