| 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) |
| Genre: | USGS Numbered Series |
| ProdID: | 11016 |
| Citation Author: | Schimschal, Ulrich |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iii, 26 p. ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 81-402 |
| Citation Search Results Text: | Mathematical model of gamma-ray spectrometry borehole logging for quantitative analysis; 1981; OFR; 81-402; Schimschal, Ulrich |
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| Citation Year: | 1981 |
| Type: | citation/reference |
| Text: | Mathematical model of gamma-ray spectrometry borehole logging for quantitative analysis; 1981; OFR; 81-402; Schimschal, Ulrich |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1981/0402/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1981/0402/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
