Calcium Tungstate ( CaWO4 )
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Lattice of Calcium Tungstate | CaWO4 | CaWO4-Nd, CaWO4-Ce, CaWO4-Pr, CaWO4-Sm, CaWO4-Er, CaWO4-Eu |
Standard orientations | (010) - (100) -(001) - (110) - (111) all others on request | |
Structure | Tetragonal, Scheelit | |
Lattice constants | a = 5,25 A b = 11,40 A | |
Color | colorless |
Comparison, GSO, BGO, CWO, NaJ | |||
Properties of scintillation Crystals | |||
Crystal Item | BGO Bi4Ge3O12 | CWO CdWO4 | |
Effective atomic number | 75 | 65 | |
Density (g/cm³) | 7.13 | 7.90 | |
Decay constant (ns) | 300 | 5000 | |
Light output (%) | 12 | 39 | |
Maximum emission wavelagth (nm) | 480 | 540 | |
Refractive index | 2.15 | 5.25 | |
Sensitivity to moisture | None | None | |
Cleavage | None | Yes | |
Attenuation coefficient | X-ray 150 KeV | 9.84 | 7.64 |
(cm-1) | Y-ray 511 KeV | 0.955 | 0.856 |
Characteristics | Application | ||
GSO | Short decay time | High performance | |
Positron CT | |||
BGO | Better absorption of | Positron CT | |
Radioactive rays | Detection of high energy | ||
Because of its large | Partidle in the field of | ||
Effective atomic number | Fundamental physics | ||
CWO | Large light output | X-ray CT | |
Which enables the use | |||
Of silicon photo diode | [nbsp |