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SCINTILLATION CRYSTALS and
DETECTORS
NaI (Tl), CsI (Tl) and CsI (Na) are the best scintillation crystals for use in
detectors of ionizing radiation such as gamma-rays, x-rays, alpha and beta
particles.

Main Properties
Chemical Formula |
NaI (Tl) |
CsI (Tl) |
CsI (Na) |
Effective Atomic Number |
50 |
54 |
54 |
Density, g/cu cm |
3.67 |
4.51 |
4.51 |
Melting Point, oC |
651 |
621 |
621 |
Emission Maximum (l max), nm |
410 |
560 |
420 |
Index of Refraction at l max |
1.85 |
1.84 |
1.84 |
Relative Light Output, % |
100 |
45 |
85 |
Light Output, Photon/MeV, g |
4.1-5.0 x 104 |
4.5-5.1 x 104 |
3.5-4.2 x 104 |
Decay Time, ms |
0.23 |
1.0 |
0.63 |
Afterglow (after 6 ms), % |
0.5-5.0 |
0.5-5.0 |
0.5-5.0 |
Background, pulse/sec/kg |
£ 3.0 |
£ 3.0 |
£ 3.0 |
Available crystal sizes: Diameter - up to 500 mm, Length - up
to 600 mm.
Assembled detectors with and without PMT are also available in
different grades of resolution.
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