ELJEN products EJ-440 phosphor sheet distributed by
This product consists of a very uniform deposit of blue-emitting P22 type silver activated zinc sulfide phosphor applied to one side of clear polyester plastic sheet.   This is specifically intended for alpha particle detection, and the phosphor layer density is sufficient to completely absorb common alpha particles such as those from Am-241.

The phosphor layer is smooth and sufficiently robust to stand up to normal handling.   The sheets are quite flexible and can be easily cut with a scissors or paper cutter.   The EJ-440 material has often been used to successfully replace the Product #ASP3 ZnS:Ag sheets formerly manufactured by the Wm. B. Johnson Company.   EJ-440 is available in full-size sheets measuring 216mm x 279mm ( 8·1/2" x 11" ) and is also supplied in 49mm dia. ( 1.94" ) precut discs.   This material is very stable, and its shelf life at room temperature is at least two years.

Eljen Technology also offers EJ-444 which consists of the same ZnS:Ag coating on thin plastic scintillator sheets typically 0.25mm thick for dual alpha-beta detection.

  Physical and Scintillation Constants:
  Light Output, % anthracene 300% EJ-440 emission spectrum
  Wavelength of max emission, nm 450
  Decay time, nSec. 200
  Phosphor Density, mg/sq.cm 3. 25
  Phosphor Density range, mg/sq.cm +/-0. 25
  Thickness of polyester film, mm 0. 25
  Density of polyester film, mg/sq.cm 36
  Density, g/cc 1. 032
chemical compatibility     The adhesive is soluble in common alcohols and
  other organic solvents.   It is insoluble in water.


G-tech, Corp.    local representative in Japan
365-1, Sayamagahara, Iruma-shi, Saitama 358-0032
Phone# 04-2935-2777 Fax# 04-2935-2778  
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