Srl2(Eu) - Strontium IodideHigh Resolution / Low Background Scintillators

Europium doped Strontium Iodide scintillators feature very high light yields and excellent performance over a broad range of energies. SrI2(Eu) crystals are hygroscopic, relatively slow, and inherently free of intrinsic radioactivity. Srl2(Eu) scintillators are available from BNC encapsulated with an entrance window, integrally coupled to a light sensor such as a PMT or SiPM, or fully integrated in detector assemblies with light sensor and front-end electronics. 

 

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Overview

Overview 

 

SrI2(Eu) crystals are extremely bright and feature excellent proportionality. The material performs very well at both high and low energies. Typical energy resolutions are 3.5% FWHM for 662 keV and 6% FWHM for 122 keV. Srl2(Eu) is also quite radiopure. Due to its intrinsic self-absorption, the crystal requires special surface preparations techniques. Its long decay time requires long digital shaping time constants (>10 us) which can complicate high count rate behavior. The self-absorption limits the maximum size of the crystal to approximately 4 cm. 

 

Specifications 

Specifications

Density [g/cm3]

4.6

Hygroscopic

Yes

Wavelength of emission [nm]

400-480

Refractive index @ emission max

1.85

Decay time [μs]

1-5 (size dependent)

Energy resolution [%] @ 662 keV

Approx. 3.5 %

Light yield [photons/keV γ]

80

Photoelectron yield [% of NaI(Tl)] (for γ-rays)

120-140

Ce concentration

2 mol %

Typical Energy Resolution for 38 x 38 mm crystals

Energy

Resolution

59.5 keV

10%

122 keV

6%

356 keV

5%

662 keV

3.50%

1332 keV

3%

2600 keV

2.50%

Thorium spectrum of 38 x 38 mm SrI2(Eu) detector

Cs-137 spectrum of 38 x 38 mm SrI2(Eu) detector

 

Accessories  

Free Online Training Module - An Introduction to Scintillation Crystals and Detectors

Visit our Training page to access the module or for more information

 

Datasheet 

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