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Single crystals of alkali halide inorganic scintillators are useful as nuclear radiation detectors in gamma-ray spectroscopy and radiography applications. These crystals are grown in silica crucibles using the vertical Bridgman technique. Crystals of CsI:Tl coupled to suitable photo-detectors have exhibited excellent energy resolution of less than 8% at 662 keV, suitable to be used as radiation detectors in gamma-ray spectroscopy for the identification of radio-active nuclides.
BARC has developed a novel crystal growth system based on the modified Bridgman technique to grow high quality, crack-free single crystals of CsI:Tl. Single crystals of CsI:Tl up to 50 mm in diameter and 60 mm in length could be grown with almost 100% yield. Expertise has been developed to process the grown CsI:Tl crystals and fabricate scintillator detectors using photo-diodes as well as PMTs.
SPECIFICATIONS
| Crystal dimension (mm) |
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Diameter : 50 mm,
Length : 60 mm |
| Density [g/cm3] |
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4.51 |
| Melting point [°C] |
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621 |
| Energy resolution |
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Less than 8% at 662 keV |
| Hygroscopic |
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slightly |
| Wavelength of emission max. [nm] |
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550 |
| Lower wavelength cutoff [nm] |
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320 |
| Light yield [photons/keVγ] |
: |
54 |
| Photoelectron yield with PMT [% of NaI(Tl)] (for γ-rays) |
: |
45 |
| Primary Decay time (ns) |
: |
1000 |
APPLICATIONS
- Gamma-ray spectrometer
- High energy radiation detectors
- Nuclear Physics Experiments
- Area monitor
- Medical imaging
- Security baggage scanning
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