<?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:contributor>Gary L. Rowe</dc:contributor>
  <dc:contributor>Peter Schlosser</dc:contributor>
  <dc:contributor>Andrea Ludin</dc:contributor>
  <dc:contributor>Martin Stute</dc:contributor>
  <dc:creator>Stephanie Dunkle Shapiro</dc:creator>
  <dc:date>1998</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;The&amp;nbsp;&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;H-&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;He dating method is applied in a buried-valley aquifer near Dayton, Ohio. The study area is large, not all sampling locations lie along well-defined flow paths, and existing wells with variable screen lengths and diameters are used. Reliable use of the method at this site requires addressing several complications: (1) The flow system is disturbed because of high pumping rates and induced infiltration; (2) tritium contamination is present in several areas of the aquifer; and (3) radiogenic helium concentrations are elevated in a significant number of the wells. The&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;H-&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;He ages are examined for self-consistency by comparing the reconstructed tritium evolution to the annual weighted tritium measured in precipitation; deviations result from dispersion, tritium contamination, and mixing.&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;H-&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;He ages are next examined for consistency with chlorofluorocarbon ages; the agreement is poor because of degradation of CFCs. Finally, the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;H-&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;He ages are examined for consistency with the current understanding of local hydrologic processes; the ages are generally supported by hydrogeologic data and the results of groundwater flow modeling coupled with particle-tracking analyses.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1029/97WR03322</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>American Geophysical Union</dc:publisher>
  <dc:title>Tritium-helium 3 dating under complex conditions in hydraulically stressed areas of a buried-valley aquifer</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>