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Scintillation Counters and Photomultiplier Tubes

4. Optical Interfaces and Connections

Purpose -- transmit light with high efficiency,

sometimes provide mechanical stability of detector

as well (should decouple the two tasks if possible)

Interface between scintillator material and

Light guide

Optical fiber

Wavelength-shifting bar

Interface between light guide or fiber and

  photodetector

Commonly used

Optical cements and epoxies

Optical grease

Air gap

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