Detector for deep well logging

Details Detector for deep well logging Detector for deep well logging

1975-05-21

1977-01-18

Dixon, Harold A.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

250487, G01J 158

Patent

active

040041514

ABSTRACT:
A substantial improvement in the useful life and efficiency of a deep-well scintillation detector is achieved by a unique construction wherein the steel cylinder enclosing the sodium iodide scintillation crystal is provided with a tapered recess to receive a glass window which has a high transmittance at the critical wavelength and, for glass, a high coefficient of thermal expansion. A special high-temperature epoxy adhesive composition is employed to form a relatively thick sealing annulus, which keeps the glass window in the tapered recess and compensates for the differences in coefficients of expansion between the container and glass so as to maintain a hermetic seal as the unit is subjected to a wide range of temperatures.

REFERENCES:
patent: 2853621 (1958-09-01), Ruderman
patent: 2883550 (1959-04-01), Ruderman
patent: 2945955 (1960-07-01), Mossop
patent: 3560741 (1971-02-01), Strindehag
patent: 3869614 (1975-03-01), Munk

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