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Scintillation Counters and Photomultiplier Tubes

5. Photodetectors and Photomultiplier Tubes

Purpose -- transform light into electric signal for

further processing of particle information

Examples

Photomultiplier tube (CROP focus)

Photodiode

Charged-coupled device

Avalanche photodiode (APD)

Visible Light Photon Counter (cryogenics)

             Photomultiplier tube details

Entrance window

Must be transparent for light wavelengths which

         need to enter tube

Common: glass

Fused silicate -- transmits ultraviolet as well

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