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Lumibird - Laser Diodes & Components 1-25 LB
Photonics Dictionary

sonde

A ruggedized scintillation counter used in oil well logging. The cylindrical housing contains a gamma ray source, a crystalline scintillator and a photomultiplier tube. As the sonde is drawn through a test bore hole, the detector measures photons emitted by the interaction between the gamma rays and the geological formations surrounding the hole.
 
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