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  • >

    Cadium Tungstate Scintillation Crystal

    Cadium tungstate (CdWO4, CWO) single crystal is an important scintillation materials applied in the radiation detection technology, especially for security checking , industral 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 ligh 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

    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  Ultraviole-visible transmission spectra                                       Fig.2  X-ray stimulated luminescence spectra


                                 

                          

                      Fig. 3 Energy spectrum and light yield of CWO                      Fig. 4  lumiescence 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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  • 陈飞宇出席Vogue Film时装电影展 潮酷少年初长成 2019-10-06
  • 校外培训机构专项整治 对无证无照超纲超前说“不” 2019-10-06
  • 欧盟采取措施反击美国加征关税 2019-09-29
  • 女子痴迷鹿晗 商场门口对人形立牌拭泪亲吻 2019-09-29
  • 紫光阁中共中央国家机关工作委员会 2019-09-26
  • 好事要支持,解决劳动力更是好事 2019-09-26
  • 来自井下580米的呼唤文章中国国家地理网 2019-09-22
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