Patents Represented by Law Firm Schlumberger Limited
  • Calibrator for radioactivity well logging tools
    Patent number: 4119847
    Abstract: A radioactivity well logging tool including a gamma radiation detector is field calibrated with the help of a flexible sheet having a radioactive substance dispersed therein, which is wrapped about the tool so as to completely surround the detector. The sheet is made of an elastomer such as polyurethane, and the radioactive substance is carnotite. This sheet is placed within a nylon sheath which has straps for holding the calibrator wrapped around the tool.
    Type: Grant
    Filed: October 28, 1976
    Date of Patent: October 10, 1978
    Assignee: Schlumberger Technology Corporation
    Inventor: James A. Waggoner