Direct Measurement of Uranium by Prompt Fission Neutron Method of Pulsed Neutron Borehole Logging: ABSTRACT
1979
The capability provided by neutron logging techniques for the direct measurement of uranium is extremely valuable, especially in low-grade uranium mineralization not in equilibrium. Sandia Laboratories is developing one of these techniques which is based on the detection of epithermal prompt fission neutrons that result from the irradiation of uranium by 14 MeV neutrons from a pulsed neutron generator. A 70-mm O.D. development-model logging probe has been used in a limited field evaluation of the prompt fission neutron method of logging. From this evaluation has evolved a prototype logging probe and the basis for log interpretation. Additional logs required for interpretation are a caliper log and a density log. Additional probe development is under way including a neutro generator with a neutron output greater than 109 n/s. A vendor is being developed as a commercial source for the neutron generator. A definition of the interim logging system has been released and the system eventually developed will be defined in the open literature. End_of_Article - Last_Page 686------------
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