General Characteristics of Multiplier Phototubes

A multiplier phototube consists of a light-sensitive photocathode followed by a series of dynodes arranged to multiply the electron emission from the photocathode. The electrical arrangement and basic circuitry used are described in Chapter 9. 

Dynode configuration refers to the shaping and positioning of the dynodes so all stages are efficiently utilized. A number of different configurations are 

Commonly Used Multiplier Phototubes for Analytical Spectroscopy 

Multiplier phototube Spectral response Wavelength range, A 

Transit time is the time interval between the arrival of the light pulse at the entrance window of the tube and the time at which the output pulse at the anode terminal reaches a peak. The transit time is usually not a factor in analytical spectroscopy, although it is important in scintillation counting. The transit time is a function of the geometry of the multiplier phototube as well as the voltage between the anode and cathode. Transit time will be of the order of 20-100 nsec in most multiplier phototubes at normal operating voltages. 

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