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Photomultiplier Tubes

BioPhotonics
Oct 2010
Hamamatsu CorporationRequest Info
 
Hamamatsu Photonics K.K.’s Electron Tube Div. has introduced a photomultiplier tube with enhanced UV sensitivity. The R11540 is a 28-mm-diameter side-on device with a spectral response ranging from 185 to 760 nm. It produces 40% quantum efficiency at 350 nm and anode sensitivity of 11.3 x 105 A/W at 350 nm and 12 x 105 A/W at 420 nm. Its sensitivity and high gain of 1 x 107, typical, make it suitable for low-light detection of UV and visible light in fluorescence spectrometers. It also can be used as a fluorescence detector for high-performance liquid chromatography, as a sulfur dioxide monitor, as a fluorescence immunoassay detector for clinical use, and as a fluorescence, emission and atomic absorption spectrophotometer. The photocathode material is Bialkali, the window material is UV glass, and the wavelength of maximum response is 420 nm. Average anode current is 0.1 mA, and operating temperature is from —30 to 50 °C. The instrument has an 11-pin base and weighs 45 g.


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GLOSSARY
atomic absorption spectrophotometer
An instrument used to analyze the sharp resonance line of a sample that, in a flame, emits an atomic vapor. It consists essentially of a light source, a combustion system, a monochromator, a photomultiplier and an electronic readout system.  
fluorescence
The emission of light or other electromagnetic radiation of longer wavelengths by a substance as a result of the absorption of some other radiation of shorter wavelengths, provided the emission continues only as long as the stimulus producing it is maintained. In other words, fluorescence is the luminescence that persists for less than about 10-8 s after excitation.
photocathode
An electrode used to release photoelectric emission when irradiated, making it then the irradiated negative electrode of a phototube.
spectral response
Measure of a detector's signal during exposure to radiation of a constant power level and varying wavelength.
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