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Integrally-Mounted Scintillation Assemblies
Integrally-mounted scintillation assemblies have advantages such as permanent light sealing, ensuring photomultiplier dark adaptation and preventing accidental photomultiplier damage by application of high voltage to the tube exposed to the light. Advanced encapsulating techniques and photomultiplier selection help to improve the energy resolution and the long-term stability of the probes.
Demountable AssembliesA scintillation crystal in this unit is mounted independently and can be replaced according to the type of measured radiation. Different scintillation crystals may be exchanged quickly and simply by means of a fl ange nut. A demountable detection unit consists of a scintillation detector and a housing with a photomultiplier tube, a voltage divider and cables with connectors. Company ENVINET a.s. will be pleased to cooperate with the customer in the design of both detection assemblies for requested applications.
Reference Light Pulsers
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The integrally-mounted scintillation assemblies are hermetically sealed units containing a NaI(Tl) crystal optically coupled to a photomultiplier tube. The assemblies are designed for crystals up to 5 inches in diameter. An internal magnetic shield is built into each detector which serves as suffi cient protection against the earth magnetic fi eld. A complete SBG detector ended with PMT pins can be simply used as a plug-in unit. A NKG unit is equipped with a voltage divider and ended with connectors.
The stabilization technique of scintillation spectrometers requires a light pulser, which produces pulses of similar shape as those produced by gamma absorption in the NaI(Tl) or another inorganic crystals and which can be easily included in the crystal assembly. The SIK model consists of NaI(Tl) crystal and a 241Am alpha radiation source generating light pulses for stabilization. The alpha particles are absorbed in the fi rst few microns of the crystal and resulting light is led through the whole crystal to the photomultiplier.