System for simultaneous measurement of borehole and formation neutron lifetimes
US4388529A · kind A · utility
13Cited by
6References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1982 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Jun 23, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/616
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.