Mathematical model of gamma-ray spectrometry borehole logging for quantitative analysis
Open-File Report
81-402
By: Ulrich Schimschal
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Abstract
A technique for analyzing gamma-ray spectral-logging data has been developed, in which a digital computer is used to calculate the effects of gamma-ray attentuation in a borehole environment. The computer model allows for the calculation of the effects of lithology, porosity, density, and the thickness of a horizontal layer of uniformly distributed radioactive material surrounding a centralized probe in a cylindrical borehole. The computer program also contains parameters for the calculation of the effects of well casing, drilling fluid, probe housing, and losses through the sodium-iodide crystal. Errors associated with the commonly used mathematical assumption of a point detector are eliminated in this model. (USGS)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Mathematical model of gamma-ray spectrometry borehole logging for quantitative analysis |
| Series title | Open-File Report |
| Series number | 81-402 |
| DOI | 10.3133/ofr81402 |
| Edition | - |
| Year Published | 1981 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey, |
| Description | iii, 26 p. ;28 cm. |
| Google Analytic Metrics | Metrics page |