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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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  • 【高清组图】和硕县举办第十二届端午龙舟赛 2020-01-26
  • 联播快讯:国务院安委办约谈辽宁省人民政府 2020-01-12
  • 吉利博瑞GE部分配置曝光 5月底正式上市 2020-01-10
  • 尼日利亚巴耶尔萨州州长签署反邪教法令 2020-01-05
  • 欧洲城堡的兴衰轨迹:起于硝烟终于炮火 2019-12-28
  • 兵团第十二师三坪农场:民族团结一家亲 我和亲戚同劳动 2019-12-28
  • 清凉端午过后 气温重回30℃ 2019-12-13
  • 东风悦达起亚家园获第十二届人民企业社会责任奖年度案例奖 2019-12-02
  • 以前刷在墙上的是政府承诺,“只剩一个好,政府来养老”。 2019-11-27
  • 粤港澳大湾区如何打通金融脉络? 2019-11-27
  • 【译事帖】小鲜肉Little Fresh Meat} 2019-11-18
  • 南非办“武林大会” 看看中国文化在国外有多火 2019-11-18
  • 金融战,贸易战,是看不见硝烟的战争,但代价同样是惨烈的。面对强敌,奉陪到底,打好这场事关国运之战。 2019-11-16
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