Multichannel analyzer

A graph of number of counts against channel number
The output of an MCA used in pulse-height analysis mode to analyze a Cs-137 source

A multichannel analyzer (MCA) is an instrument used in laboratory and field applications to analyze an input signal consisting of voltage pulses. MCAs are used extensively in digitizing various spectroscopy measurements, especially those related to nuclear physics, including various types of spectroscopy (alpha-, beta-, and gamma spectroscopy).

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