Density measurements of borehole fluids using axially

Claim 1

APPARATUS FOR DETERMINING THE DENSITY OF FLUID INCLUDING AN ELONGATED HOLLOW FLOW CHANNEL ADAPTED TO BE SUPPORTED FOR MOVEMENT THROUGH A CONDUIT CARRYING SUCH FLUID AND ADAPTED TO DIRECT SAID FLUID THERETHROUGH UPON MOVEMENT THROUGH SAID CONDUIT, A SOURCE OF GAMMA RADIATION, MOUNTING MEANS FOR SUPPORTING SAID SOURCE WITHIN AND ADJACENT TO ONE END OF SAID FLOW CHANNEL AND ADAPTED HIGHLY TO ATTENUATE GAMMA RADIATION IN ALL DIRECTIONS EXCEPT ALONG A PATH PARALLEL TO THE AXIS OF THE FLOW CHANNEL TO PREVENT REACTION WITH SUBSTANCES IN AND ADJACENT THE WALLS OF SAID CONDUIT, MEANS INCLUDING AN ENERGY SENSITIVE GAMMA-RAY DETECTOR SUPPORTED IN SAID PATH AT A POINT SPACED LENGTHWISE ALONG SAID CHANNEL FROM SAID SOURCE TO DETECT GAMMA RADIATION PASSING THROUHG SAID FLUID INTERMEDIATE SAID SOURCE AND SAID DETECTOR, AND MEANS FOR MEASURING THE DETECTED GAMMA RADIATION.