| 摘要 |
<p>SYSTEM FOR SIMULTANEOUS MEASUREMENT OF BOREHOLE AND FORMATION NEUTRON LIFETIMES (Docket No. WPC-32) A system is disclosed for measuring simultaneously the formation and borehole components of thermal neutron lifetime or decay time. The borehole and formation are irradiated with 14 MEV pulsed neutrons. During the internal between neutron pulses capture gamma radiation is measured in at least four, non-overlapping, contiguous time gates. A background radiation measurement is also periodically made. Background corrected capture gamma ray measurements are combined to derive simultaneously the formation and borehole components of thermal neutron lifetime which are recorded as a function of borehole depth.</p> |
