Daly detector

A Daly detector, named after Norman Richard Daly, is a scintillation detector for the detection of ions.

Structure, function and scope

The Daly detector consisting of a metal button, a scintillator ( phosphor screen ) and a photomultiplier. Ions striking the metal button, trigger secondary electrons. Between the metal knob and the scintillator, a high voltage is applied so that the electrons are accelerated onto the scintillator back and they trigger photons. These photons are detected by the photomultiplier.

Daly detectors are commonly used in mass spectrometers. Daly advantage of the detector is that of the photomultiplier can be separated through a glass window, which transmits the photons from the interior of the mass spectrometer, which otherwise possible contamination is prevented and extended life.

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