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The ROSAT high-resolution imager HRI\ is very similar to the Einstein Observatory HRI and is comprised of two cascaded microchannel plates (MCPs) with a crossed grid position readout system.
The detector performance can be characterized by such parameters
as those listed in
Table5.1.
Two significant changes from the Einstein instrument that
have affected the performance of the detector are: the substitution
of CsI for MgF 
as the detector photocathode, and the introduction
of a thin aluminum-coated plastic membrane (the ``electrostatic shield'')
near the front MCP (in addition to the UV/Ion shield which is situated
farther in front of the detector).
internal 
s 
)
external 
XRB 
Typical Total 
sec 
Depending upon orbital location.
Depending upon viewing direction.