Method of neutron borehole logging

Claim 1

THE METHOD OF LOGGING A BORE HOLE WHICH COMPRISES PASSING THROUGH THE HOLE A SOURCE OF RADIATION FROM WHICH NEUTRONS AND GAMMA RAYS ARE EMITTED, SOME OF THE NEUTRONS PENETRATING THE FORMATIONS SURROUNDING THE HOLE WHEREBY DUE TO NUCLEAR COLLISION WITH THE ATOMS OF THE FORMATIONS GAMMA RAYS ARE INDUCED, SOME OF THE INDUCED GAMMA RAYS ENTERING THE HOLE, WHILE SIMULTANEOUSLY THEREWITH GAMMA RAYS FROM THE SOURCE ARE SCATTERED WITHIN THE FORMATIONS AND RETURNED TO THE HOLE, IMPRESSING AN ELECTRICAL POTENTIAL ON A SINGLE IONIZABLE MEDIUM OF RELATIVELY LOW DENSITY AND EXPOSING SAID MEDIUM TO SAID INDUCED GAMMA RAYS AND TO SAID SCATTERED GAMMA RAYS INTERCEPTING THE HOLE WHEREBY ELECTRICAL PULSES ARE CREATED IN SAID IONIZABLE MEDIUM, THE SIZE OF THE PULSES DEPENDING UPON THE ENERGY OF THE RADIATION INTERCEPTED, AND RECORDING ONLY THOSE PULSES CREATED IN SAID MEDIUM BY THE INDUCED GAMMA RAYS, AND WHICH ARE LARGER THAN THE PULSES ALSO CREATED IN SAID MEDIUM DUE TO SCATTERED GAMMA RAYS.

Claim 2

THE METHOD OF LOGGING A BORE HOLE WHICH COMPRISES PASSING THROUGH THE HOLE A SOURCE OF RADIATION FROM WHICH NEUTRONS AND GAMMA RAYS ARE EMITTED, SOME OF THE NEUTRONS PENETRATING THE FORMATIONS SURROUNDING THE HOLE WHEREBY DUE TO NUCLEAR COLLISION WITH THE ATOMS OF THE FORMATIONS GAMMA RAYS ARE INDUCED, SOME OF THE INDUCED GAMMA RAYS ENTERING THE HOLE, WHILE SIMULTANEOUSLY THEREWITH GAMMA RAYS FROM THE SOURCE ARE SCATTERED WITHIN THE FORMATIONS AND RETURNED TO THE HOLE, IMPRESSING AN ELECTRICAL POTENTIAL ON A SINGLE IONIZABLE MEDIUM OF RELATIVELY LOW DENSITY AND EXPOSING SAID MEDIUM TO SAID INDUCED GAMMA RAYS AND TO SAID SCATTERED GAMMA RAYS INTERCEPTING THE HOLE WHEREBY ELECTRICAL PULSES ARE CREATED IN SAID IONIZABLE MEDIUM, THE SIZE OF THE PULSES DEPENDING UPON THE ENERGY OF THE RADIATION INTERCEPTED, AND RECORDING ONLY THOSE PULSES CREATED IN SAID MEDIUM BY THE INDUCED GAMMA RAYS, AND WHICH ARE LARGER THAN THE PULSES ALSO CREATED IN SAID MEDIUM DUE TO SCATTERED GAMMA RAYS.