Almaz Optics, Inc.
12 Chadsford Ct.  Marlton, NJ 08053, USA
Tel:  856 797-0491, Fax: 856 797-0228
e-mail: mail@almazoptics.com

 

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.

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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.