Kerr-mcgee Corporation

Kerr-mcgee Nuclear Corporation

Larry S Trowsdale

James D Shreve, Jr

Adare Hill

A borehole survey method and apparatus for use in drilling substantially horizontal boreholes through a mineral deposit wherein a dip accelerometer, a roll accelerometer assembly and a fluxgate are disposed near the drill bit, which is mounted on a bent sub, and connected to a surface computation and display unit by a cable which extends through the drill string. The dip angle of the borehole near the drill bit, the azimuth of the borehole near the drill bit and the roll angle or orientation of the bent sub are measured and selectively displayed at the surface while the drill string is in the borehole for utilization in guiding the drill bit through the mineral deposit along a predetermined path.

Borehole survey method and apparatus for drilling substantially

An improved method and apparatus for providing an indication of the radiation activity of the radioactive decay products of radium in an environment wherein the alpha particle activity and the beta particle activity at a test site are detected and the detected alpha particle and the beta particle activities provide the indication of the radiation activity of radon and the decay products of radon at the test site. The background radiation activity at the test site is detected, and the detected alpha particle and the beta particle activities less the detected background radiation activity provide the indication of the radiation activity of radon and the decay products of radon. The sum of the detected alpha particle and beta particle activities provides an indication of the working level (WL); the difference between the detected alpha particle and the beta particle activities provides an indication of the radon concentration at the test site and the equivalent ingrowth time of the radon decay products (radon daughters) from the earlier existence of the radon as a gas; and the detected background radiation activity provides an indication of the penetrating radiation hazard at the test site.

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Oklahoma City, OK, United States of America

Larry S Trowsdale