Importance

Loading Importance Indicators...

Abstract

Apparatus for insulating enclosed electronic devices against damaging temperatures when used in deep, hot well bores. Includes a first vacuum chamber insulating means defined by outer casing of well-logging tool and inner casing. First vacuum chamber defines a components chamber to shield contents against the temperature in a well bore. A second vacuum chamber mounted within components chamber is defined by an outer tube and an inner tube. Outer tube has a thickened wall and is of material suited to serve as heat sink within components chamber. Second vacuum chamber defines detection chamber to shield contents against the temperature within components chamber. Thickened wall is undercut to define a thin wall adapted to function as a window for radiation to pass from an earth formation outside said logging tool into a radiation detector disposed within said detection chamber. Further includes radiation screen located in said undercut and around said window to shield said detector means from radiation below a selected level of energy.

Loading the Abstract Image...

First Claim