gas-filled X-ray detector

The gain of this process is defined as the number of
electrons collected on the anode wire for each primary electron produced. For X-rays having energies
higher than the excitation potential of the detector gas, the spectral responsivity function has a second
peak in addition to the main peak that is called the escape peak. The escape peak has a mean pulse
height proportional to the difference between the photon energy of the incident X-rays and of the
spectral characteristic line of the detector gas.

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