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Scintillation Crystals and Detectors
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DETECTORS
Standard detectors with NaI(Tl), CsI(Tl) and CsI(Na) can be delivered in different modifications. In all modifications, the scintillator is a solid cylinder, having contact to the glass output window of the container and sealed in aluminium housing. When your tasks require the low-background detectors, housings made from other metals are possible.
   For gamma- radiation detection and spectrometry, assemblies having scintillation crystals and a photomultiplier tube (PMT) assembled in a hermetically sealed body are deliverable.
CRYSTALS
The technology for growing crystals made it possible to pull high-quality ingots of:
- CWO - 60 mm in diameter and 150 mm long, - NaI(Tl), CsI(Tl) and CsI(Na) - ingots (up to 100 mm in diameter and 250 mm long)
- PWO - 30 mm in diameter and 250 mm long - BGO - 75 mm in diameter and 150 mm long or 55 mm in diameter and 230 mm long
- GSO - 55 mm in diameter and 180 mm long - ZnSe(Te) - 25-40 mm in diameter and 120-150 mm long

We supply rods, slabs, arrays made from mentonied scintillators with different cross-sections and dimensions. Different dopants with different concentrations are available for specific customer requirements.
Properties/crystal
CsI (Tl)
NaI (Tl)
CsI (Na)
BGO
GSO
PWO
NPWO
CWO
ZnSe(Te)

Crystal structure

cubic

cubic
cubic
cubic
-

Tetragonal

Tetragonal

Tetragonal
-

Lattice constant( Å )

4.566

6.46
-
-
-

a = 5.416, c = 12.049

a=5,281, c=11,510
-
-

Melting point, °C

894

924
894
1050
1950

1123

920

1325
1773 - 1793

Density, g/cm3

4.51

3.67
4.51
7.13
6.71

8.28

7.57

7.9
5.42

Mohn hardness

2

2
2
5
6

3.5- 4.0(C)

4.9

4 - 4.5
-

Thermal expansion, 10-6/K

50

47.4
49
-
-

10
-

10.2

-

Refractive index

1.79

1.85
1.84
1.05-1.12
1.38

2.16

2.31

2.2 - 2.3
2.58 - 2.61 at 610 nm

Emission wavelength (nm )

560

410
420
300
440

450 / 420

520, Cherenkov eff.

470/540
610(fast), 640(slow)

Decay constant (ns )

1000

230
630
5
6

6

6

20 ns @ 470nm
5 ms @ 540 nm
1-3(fast), 30-70(slow)

Radiation length (cm )

1.86

2.9
-
-
-

0.92

-

0.3
-

Hygroscopic

yes

yes
yes
No
No

No

No

No
No

Afterglow % at 6ms

0.05 - 5.0

0.5 - 5.0
0.5 - 5.0
-
-

-

-

0.1
< 0.05

Effective atomic number
54
50
54
75
59
73
74
65
33

Light yield [photons/MeVy]

52- 56 x103

38 x 103
(35 - 42) x 103
-
-

22.6~ 25.6x 104

5% of BGO

1.2 - 1.5 x 104
8.0 x 104

Background, pulse/sec/kg
< 3.0
< 3.0
< 3.0
-
-
-
-
-
-

Crystal cleavage plane

none

(100)
none
-
-

(101)

-

(010)
-

I N Q U I R Y    F O R M :

Material:
Quantity of elements:
Application:
polished sites:

BLOCK    or  BLOCK
  a-b b-c a-c
or d  
Orientation:
(if applicated)
Dimensions/Tolerances:
 For example:
10.0 +/- 0.1
AR-coating:
a = mm;
c = mm		 b = mm or
dia. = mm;
This field is for additional information such as application,
comments, add. requirements etc.
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