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. Author manuscript; available in PMC: 2010 Oct 21.
Published in final edited form as: Nucl Instrum Methods Phys Res A. 2009 Oct 21;610(1):11–15. doi: 10.1016/j.nima.2009.05.032

Figure 2.

Figure 2

Diagram of a hybird photodetector. A photon incident on the photocathode liberates a photoelectron. The photocathode is biased 10–15 kV negative with respect to a solid state detector (either a PIN diode or an avalanche diode), which accelerates the electron and causes it to collide with the solid state detector. The electron kinetic energy creates gain, and additional gain can be created in the solid state detector (in the case of the avalanche detector).