Calcium Tungstate
CaWO4

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