What material is the photocathode made of?
Photocathodes are typically made of alkali-metal films such as potassium bromide (KBr), cesium telluride (CsTe), cesium iodide (CsI), or rubidium telluride (RbTe).
What is photomultiplier gain?
Photomultiplier tubes (PMTs) are used to detect light that comes from gamma- ray initiated showers in the earth’s atmosphere. The gain of the PMTs are key to determining the amount of light detected and subsequently, the energy of the incoming gamma ray.
How do photomultiplier tubes work?
A photomultiplier tube, useful for light detection of very weak signals, is a photoemissive device in which the absorption of a photon results in the emission of an electron. These detectors work by amplifying the electrons generated by a photocathode exposed to a photon flux.
What does a photocathode emit?
photocathode, an element of a photoelectric cell (q.v.) that emits electrons when struck by light, making possible the flow of electric current through the device. A substance often used for photocathodes is a partially oxidized silver–cesium alloy.
What is the quantum efficiency of a photocathode?
Some photocathode materials (see below) reach quantum efficiencies of more than 30% in some spectral region, while others (particularly those for the infrared) are limited to the order of 10% or even substantially lower.
How much does a PMT cost?
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What is PMT voltage?
Typical flow cytometer instruments use photomultiplier tubes (PMTs) to detect the fluorescence in the samples. The initial signal (light hitting the detector) is amplified within the PMT to improve the sensitivity and resolution of the measurements.
What does a photocathode do?
Where are photomultiplier tube used?
photomultiplier tube, electron multiplier tube that utilizes the multiplication of electrons by secondary emission to measure low light intensities. It is useful in television camera tubes, in astronomy to measure intensity of faint stars, and in nuclear studies to detect and measure minute flashes of light.
What are dynodes made of?
The dynode is made of a metal plate containing a substance on the surface such as a bialkali compound, which emits secondary electrons upon impact with accelerated electrons. The acceleration of the photoelectrons and the impact of these on the dynode produce multiple secondary electrons.
