<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Ulrich Schimschal</dc:creator>
  <dc:date>1981</dc:date>
  <dc:description>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)</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/ofr81402</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey,</dc:publisher>
  <dc:title>Mathematical model of gamma-ray spectrometry borehole logging for quantitative analysis</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>