Chromox Fluorescent Screens

Advatech Chromox Fluorescent Screens

Chromox Fluorescent Screens - AF995R - are formulated from alumina (Aluminium Oxide) ceramic, lightly doped with Chromium Oxide. These screens have been utilized at CERN, DESY, ILC etc and proven over several decades in high energy beam diagnostic applications. They are physically robust and able to withstand the effects of high energy beams and the corresponding high operating temperatures.

Chromox Fluorescent Screens:

  • Scintillate at 694nm (Decay Time: 3.4ms) and 691nm (Decay Time: 6.7ms)
  • Have a high photon yield: 5 x 10⁴ photons/MeV
  • Are sensitive down to 10 protons/cm²
  • Have good response linearity
  • Are resistant to high levels of radiation (up to 10⁹ protons/mm²)
  • Have extensive operation history

Chromox Fluorescent Screens - Optical Properties

Property Units Value
Wavelength (Max. Emission) nm 691, 694
Wavelength - B/W nm TBA
Decay Times ms 6.7, 3.4
Light Yield ph/MeV 5 x 10⁴
Photoelectron Yield % of NaI(Tl) TBA
Attenuation Coefficient @693nm cm⁻¹ 8

Chromox Fluorescent Screens - Mechanical Properties

Property Units Value
Chemical Formula Al2O3 (99.5%) + Cr2O3
Grain Size um 10 - 15
Porosity % 0
Density g/cm³ 3.85
Temperature - Melting Point ºC 2000
Temperature - Max. Operating ºC 1600
Specific Heat (@20ºC) J/kg K 900
Thermal Conductivity Coeff. W/m/ºC 30
Thermal Expansion Coeff. 10⁻⁶/ºC 6.9
Hardness Mohs 8.5
Young's Modulus GPa 317
Knoop kgf/mm2
Sheer Modulus GPa 54.66
Poisson's Ratio 0.25
Chemical Durability ug/hrcm2

Further Reading/Publications

Standard Sizes

100/100 mm, 50/50 mm (Standard Sizes)
1 mm (Standard Size)

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