Neutron method and apparatus for determining total cross-section
US4384205A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1980 |
| Grant date | May 17, 1983 |
| Priority date | — |
| Expiry date | Nov 5, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/616
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and an apparatus for quantitatively determining the macroscopic thermal neutron absorption cross-section of a geological formation traversed by a borehole is disclosed. The method comprises the steps of irradiating the formation with neutrons from a continuous source in a neutron sonde and detecting through the use of dual epithermal and thermal detectors the resultant flux of both thermal and epithermal neutrons. Representative signals are then combined in a manner which best takes advantage of the physics of the interaction of neutrons with matter to produce a representation of the macroscopic thermal neutron absorption cross-section. Thus, a signal representing the ratio of the counts is derived from each like pair of detectors. The logarithms of the signals are then taken and combined in a linear combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.