This picture shows the production of escape peaks. The incoming photon produces Ge or Si K radiation (depending on what the detector is made of). If the K radiation escapes from the detector a part of the incoming energy is lost. Because of this loss, less photo electrons are produced and the pulse height will be lower. The pulse is detected as a pulse with energy Ein – EGeK for a Ge detector and Ein – ESiK for a Si(Li) detector. The energy of the Ge K lines is about 10 keV so the escape peak is about 10 keV lower than the incoming radiation. Whereas, the energy of the Si K lines is about 1.7 keV so the escape peak is about 1.7 keV lower than the incoming radiation.
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