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BaF2 Scintillation Crystal

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Specifications

Barium fluoride (BaF₂) is presently the fastest known scintillator. It has an emission component with subnanosecond decay time that yields very fast timing. Fast timing is required for positron lifetime studies, time of flight measurements, Positron Emission Tomography (PET) and certain high energy or nuclear physics applications. Using special electronics, time resolutions around 200 ps are possible for small detector geometries.

BaF₂ has several scintillation emission bands. The fast scintillation light is emitted in the UV in bands centered at 220 and 195nm. The decay time of the fast component varies between 600 and 800ps.

To detect the fast scintillation light, it is necessary to use a photomultiplier tube with a quartz entrance window. Furthermore, the optical coupling compound must have a good transparency for UV light. Usually silicon oils or compounds are used.

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