For light sources remote from the pmt, such as a star, you can choose from the full range of window geometries. When the light source is directly coupled to the pmt, as in the case of a scintillation crystal, a flat window is best.
The range of window geometries is shown below. Further information is available in our photomultiplier brochure. Request a copy via this form.
circular
Diameters from 15 to 135 mm available to suit diffuse and directly coupled light sources. Typical applications
include scintillation counting and general uses.
reduced area
Sensitive diameters of 2.5 mm to 10 mm for applications where light can be concentrated or focused.
The reduced photocathode area provides the benefit of lower dark current (see step 6).
domed window
The inherent strength of this construction allows us to use a very thin window, reducing its radionuclide content. The window is often supplied sand blasted to enhance quantum efficiency.
2 pi
Sidewall sensitivity allows wide angle light detection. A typical application is in probes
for scintillation counting.
hemisperical
Wide angle light detection from diffuse light sources such as the atmosphere or
large liquid scintillation counters. Application are mainly in fundamental research.
side window
A geometry that offers a small footprint in analytical instruments, such as spectrophotometers.
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