Daly detector

from Wikipedia, the free encyclopedia

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

Structure, functionality and area of ​​application

The Daly detector consists of a metal button, a scintillator ( phosphor screen ) and a photomultiplier . Ions that hit the metal button trigger secondary electrons . A high voltage is applied between the metal button and the scintillator , so that the electrons are accelerated towards the scintillator and trigger photons there. These photons are detected by the photomultiplier.

Daly detectors are widely used in mass spectrometers . The advantage of the Daly detector is that the photomultiplier can be separated from the interior of the mass spectrometer by a glass window that lets the photons through, which prevents contamination that would otherwise be possible and extends the service life.

literature

  • NR Daly: Scintillation Type Mass Spectrometer Ion Detector. In: Review of Scientific Instruments. 3, 31, 1960, pp. 264-267.