SrI2 (SrI2:Eu): Strontium Iodide scintillators enable high resolution gamma-ray spectroscopy because of the high light output and exceptional linearity of the material. SrI2:Eu performs well at both high and low energies. Lack of intrinsic radioactivity reduces background counts and reduces false alarms.
Strontium Iodide scintillators can be used in a range of hand-held Personal Radiation Detection (PRDs) instruments, as well as medical, industrial, and environmental applications. Packaged SrI2:Eu scintillators can easily be incorporated into hand-held radiation detectors to enhance their performance considerably when compared to a Thallium-doped Sodium Iodide (NaI:Tl) scintillator.
SrI2, used as a scintillation gamma radiation detector, is typically doped with europium, due to its optical clarity, relatively high density, high effective atomic number (Z=48), and high scintillation light yield.
- Material: SrI2:Eu
- Melting Point: 538°C
- Density: 4.59 g/cm3
- Zeff: 49
- Crystal Structure: Orthorhombic
- Water Solubility: Hygroscopic
- Refractive Index: 1.85
- CTE: 2.164 x 10-5/°C (lattice b)
- Emission Spectral Range: 400 – 480 nm
- Peak Scintillation Wavelength: ~ 435 nm
- Decay Constants (Eu2+): 1 – 5 μs *
- Scintillation Light Yield: 80,000 ph/MeV
- X-ray Absorption Coef. at 100 KeV: 2.88 cm-1
- X-ray Absorption Coef. at 662 KeV: 0.13 cm-1
- Radiation Length: 1.95 cm
* depending on sample size
- 25mm diameter/25mm long cylinder
- 38mm diameter/38mm long cylinder
- Sealed package
- Scintillation crystal permanently mounted to a photomultiplier tube (PMT)
< 4 % FWHM at 662 keV line of 137Cs