Transcription of Photomultiplier Tubes
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Photomultiplier Tubes
Photomultiplier Tubes Construction and Operating Characteristics Connections to External Circuits Photomultiplier Tubes . Construction and Operating Characteristics INTRODUCTION Variants of the head-on type having a large-diameter hemi- Among the photosensitive devices in use today, the photo- spherical window have been developed for high energy physics multiplier tube (or PMT) is a versatile device that provides ex- experiments where good angular light acceptability is important. tremely high sensitivity and ultra-fast response. A typical photo- multiplier tube consists of a photoemissive cathode (photocath- Figure 2: External Appearance ode) followed by focusing electrodes, an electron multiplier and a) Side-On Type b) Head-On Type an electron collector (anode) in a vacuum tube, as shown in Fig- PHOTO- ure 1.
6) High temperature bialkali or low noise bialkali (Na-K-Sb) This is particularly useful at higher operating tempera-tures since it can withstand up to 175°C. A major application is in the oil well logging industry. At room temperatures, this photocathode operates with very low dark current, making it ideal for use in photon counting applications.
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