When this happens, through the miracle of secondary emission, a greater number of electrons, … en.wiktionary.2016 [noun] plural of [i]photomultiplier tube[/i] Example sentences with "photomultiplier tubes", translation memory. In radiography, an electronic vacuum tube designed to convert light photons into electrical pulses. • It is photo-emissive device in which absorption of photon results in emission of electron. Photomultiplier tubes are used in high-end drum scanners, because they are more sensitive to light than the CCD elements used in lower-cost devices. In a photomultiplier tube, electrons are emitted from a photocathode and accelerated in a beam that strikes the dynode, which is a polished metal electrode suitably biased. PMT (abbreviation) Hypernyms . The photomultiplier tube generally has a photocathode in ei-ther a side-on or a head-on configuration. Definition of photomultiplier in the Definitions.net dictionary. An array of these tubes is situated behind the sodium iodide crystal and may be placed directly on the crystal, connected to the crystal by light pipes, or optically coupled to the crystal with a silicone-like material. 8 - Photomultiplier tube basics Still setting the standard For more than sixty years, photomultipliers have been used to detect low-energy photons in the UV to visible range, high-energy photons (X-rays and gamma rays) and ionizing particles using scintillators. er tube a detector that amplifies a signal (by as much as 106) of electromagnetic radiation by an acceleration of electrons released from a photocathode through a series of dynodes; as each electron strikes a dynode stage, 3-4 electrons are liberated and accelerated to the subsequent dynode. 2006, S.17–18 – 2.3 Electron Multiplier (Dynode Section) Introduction: • PMTs (Photomultiplier Tubes) are used for light detection of very weak signals. A photomultiplier absorbs light emitted by the scintillator and re-emit it in the form of electrons via the photoelectric effect. The photomultiplier tubes--422 of them so far--are the eyes of the Antarctic Muon and Neutrino Detector Array (AMANDA), an instrument whose mission is to detect elusive subatomic particles known as neutrinos arriving from space (SN: 10/5/91, p. Icy observatory launches neutrino hunt. Side-on tubes are also common. A photomultiplier tube (PMT) converts a light pulse into an electrical signal of measurable magnitude. The key advantage of a photomultiplier tube is that photoelectrons are amplified using a chain of dynodes. As … Photomultiplier tubes (photomultipliers or PMT s for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. It is used to digitize incoming light photons prior to the creation of computerized images in nuclear medicine and other imaging modalities. Information and translations of photomultiplier in the most comprehensive dictionary definitions resource on the web. Send us feedback. Alle Definitionen von PMT Wie oben erwähnt, sehen Sie in der folgenden Tabelle alle Bedeutungen von PMT. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! The photomultiplier tubes--422 of them so far--are the eyes of the Antarctic Muon and Neutrino Detector Array (AMANDA), an instrument whose mission is to detect elusive subatomic particles known as neutrinos arriving from space (SN: 10/5/91, p. Icy observatory launches neutrino hunt What made you want to look up photomultiplier tube? Photomultipliers are used to measure any process which directly or indirectly emits light. When attached to the new high-gain photomultiplier tubes and strung into the array of amplifiers, pulse-height analyzers, and scalers that emerged from the Rad Lab and Los Alamos, then and only then did the scintillator and Cerenkov radiation became part of the material culture of postwar physics.. en.wiktionary.org. Photomultiplier definition, an extremely sensitive detector of light and of other radiation, consisting of a tube in which the electrons released by radiation striking a photocathode are accelerated, greatly amplifying the signal obtainable from small quantities of radiation. Photomultiplier tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. Photomultiplier Tubes (PMT) PMT is the technology state of the art at present. photomultiplier tube. Scintillation Counter – Principle of Operation. Photomultiplier tubes (PMTs for short) are members of the class of vacuum tubes, and more specifically vacuum phototubes, which are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. A photomultiplier tube is a vacuum tube consisting of an input window, a photocathode, focusing electrodes, an electron multiplier and an anode usu-ally sealed into an evacuated glass tube. This photon is multiplied in a photomultiplier tube which converts light into an electrical signal. Can you spell these 10 commonly misspelled words? A PMT consists of a photocathode and a series of dynodes in an evacuated glass enclosure. “Photomultiplier tube.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/photomultiplier%20tube. These electrons are focused towards the electron multipliers (dynodes), which multiply the signal by secondary emission. Enrich your vocabulary with the English Definition dictionary Medical Dictionary, © 2009 … Ionizing radiation enters the scintillator and interacts with the scintillator material. en.wiktionary.org (physics) A device, normally in the form of a tube, that uses a photocathode to convert photons into photoelectrons which are then amplified. Delivered to your inbox! Photomultiplier Tubes (PMTs) Light (photons) are converted into photoelectrons by absorbing them in a thin photocathode layer inside a (glass) vacuum tube. When light is incident on the photocathode, it emits electrons into the vacuum tube. Meaning of photomultiplier. The layout shown is for an "end-on" tube. Photomultiplier Tubes (PMT) PMT is the technology state of the art at present. What does photomultiplier mean? photomultiplier tube. Most often a photocathode is semi-transparent and usually consists of a thin layer of evaporated Cs, Sb, and K atoms (or a mixture of all three). A photomultiplier is a device that converts incident photons into an electrical signal.. b) Transmission Mode CONSTRUCTION The photomultiplier tube generally has a photocathode in ei-ther a side-on or a head-on configuration. See more. photomultiplier Definitions. For example, section 4.1 shows spec-tral response characteristics of typical photocathodes and also gives the definition of photocathode sensitivity and its measurement proce-dure. Photomultiplier tubes (PMTs) are a photon detection device that uses the photoelectric effect combined with secondary emission to convert light into an electrical signal. Photomultiplier Tube (PMT), the Silicon Photomultiplier now offers a highly attractive alternative that combines the low-light detection capabilities of the PMT while offering all the benefits of a solid-state sensor. 1. This chapter details various characteristics of photomultiplier tubes, including basic and performance. An array of these tubes is situated behind the sodium iodide crystal and may be placed directly on the crystal, connected to the crystal by light pipes, or optically coupled … Search photomultiplier tube and thousands of other words in English definition and synonym dictionary from Reverso. photomultiplier tube definition in English dictionary, photomultiplier tube meaning, synonyms, see also 'photometer',photometrically',photopolymer',photonuclear'. These multiplied electrons are converted into an output signal by the anode. Section 4.2 explains dynode types, structures and typical char-acteristics. A vacuum tube that converts light into electrical energy and amplifies it. The operation of scintillation counters and photomultiplier tubes is summarized in the following points: Scintillation Counter – Principle of Operation. https://medical-dictionary.thefreedictionary.com/photomultiplier+tube, a detector that amplifies a signal (by as much as 10. 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