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	Calcium Tungstate ( CaWO₄)


Lattice of Calcium Tungstate	CaWO₄	CaWO₄-Nd, CaWO_4-Ce, CaWO₄-Pr, CaWO_4-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