ZnSe(Te)

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ZnSe(Te,O) is a new type of scintillator that exhibits a relatively high light output at longer wavelengths (red) with no afterglow and high thermal and radiation stability.


Applications

  • Tomography: coupled to Si-photodiode, it is the most suitable scintillator for this application, due to its optical and physical properties, and can be used for X-ray imaging as well
  • X-ray: ZnSe(Te) semiconductor properties and high efficiency can be combined to create scintielectronic detectors of X-ray of type "photosensitive heterostructure AIIBVI"
  • Alpha/beta spectrometry: detectors based on the Schottky barrier structure of metal - nZnSe(Te) have been developped for the detection of charged particles and UV-radiation


Technical Chart

Material ZnSe(Te,O) - Zinc Selenide
Conversion efficiency (%) 19.4
Decay time τ (µs) 5-7
Density (g/cm3) 5.4
Effective atomic number Z 33
Emission maximum λm at 300 K (nm) 610
Afterglow (after 10 ms) (%) 0.05
Attenuation coefficient at λm (cm-1) 0.1-0.3

Additional information

  • ZnSe(Te) are grown by the vertical Bridgman method in graphite crucibles under inert gas (Ar) pressure 5x106 Pa, at a temperature in the melting zone of about 1860 K.

Graphs

Spectral-luminescent characteristics of the scintillators:
  1. CdWO4;
  2. CsI(Tl);
  3. ZnSe(Te);
  4. sensitivity of Si photodiode;
  5. sensitivity pZnTe-nCdSe (Ne=2.4x1017 cm-3) photodiode;
  6. sensitivity pZnTe-nCdSe (Ne=2.4x1015 cm-3) photodiode.


X-ray sensitivity of scintillators CsI(Tl) and ZnSe(Te) as function of radiation energy
  1. ZnSe(Te,O), thickness dsc=0.7mm;
  2. CsI(Tl), dsc=0.7 mm;
  3. ZnSe(Te,O), dsc=4.0 mm;
  4. CsI(Tl), dsc=4.0 mm.


Output signal as function of X-ray (Ex≈60 keV) dose rate for detectors:
  1. ZnSe(Te)-ZnTe,
  2. ZnSe(Te)/ZnTe-CdSe and
  3. "scintillator CsI(Tl) - Si-photodiode ".


Temperature dependencies of open-circuit voltage and of short-circuit current of the CD photoreceiver.


Photosensitivity spectra of structure nZnSe(Te)-Ni at:
  1. Us=0V, T=300K
  2. Us=6V, T=300K
in the photosensitivity range of photoreceivers with light filters in :
  1. UVA
  2. UVB
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