FIELD: oil and gas industry.
SUBSTANCE: downhole gamma detector comprises scintillation crystal, photoelectric multiplier (PEM), voltage divider, attaching elements and elements compensating thermal deformation installed in a body, at that the body is made of material, which expansion factor ensures excess of the body elongation value in comparison with total crystal elongation and PEM at heating, thermal deformation compensator is made as a bushing of material with expansion factor less than the same of the body material, crystal and PEM are installed together in the body and the remaining free space is filled with polymer material poured under vacuum and polymerised afterwards.
EFFECT: improved sensitivity and mechanical stability of the detector in wide range of temperature values.
3 cl, 1 dwg
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