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Cerenkov counter
A device for detecting high-energy charged particles via the Cerenkov radiation they generate. This radiation, which appears as a predominantly bluish light, can be detected using photomultiplier ...
gamma camera
A piece of apparatus that detects radioactivity in the form of gamma rays emitted by radioactive isotopes that have been introduced into the body as tracers. It contains an activated sodium iodide ...
high-speed photometry
A form of photometry in which the photons are counted at short time intervals, generally between 10 ms and 10s, to detect rapid changes in brightness of objects such as pulsars and variable stars. ...
photocathode
The light-sensitive surface of a photomultiplier. It is a coating of a material such as caesium, rubidium, or potassium applied to the inside of a clear window of an evacuated tube.
photoelectric cell
Any of several devices that produce an electric signal in response to exposure to electromagnetic radiation. The original photocells utilized photoemission from a photosensitive cathode ...
photoelectric photometer
An instrument for measuring the brightness of a star by means of the electric current produced when its light falls on a light-sensitive surface (the photoelectric effect). The light gathered by a ...
photometer
An instrument for measuring the brightness of stars or other objects. In its widest sense the term can include the human eye or the photographic plate. Conventionally, the term is confined to ...
photomultiplier Reference library
Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)
a photocell consisting of a photocathode linked to an electron multiplier. Photons striking the photocathode cause the emission of
scintillation counter
An electronic device that counts pulses of gamma radiation emissions. It is the most sensitive method of detecting ionized radiation. See also Geiger counter.
secondary electron
An electron emitted from a solid as a result of the impact of another electron. If the energy of the incident primary electron is sufficient, more than one secondary electron ...
secondary emission
The emission of electrons from a surface as a result of the impact of other charged particles, especially as a result of bombardment with (primary) electrons. As the number of secondary electrons can ...
