Subsurface neutron production and its impact on ³⁶C1 ground-water dating

Persistent Link:
http://hdl.handle.net/10150/191838
Title:
Subsurface neutron production and its impact on ³⁶C1 ground-water dating
Author:
Kuhn, Mark William.
Issue Date:
1984
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
³⁶Cl, with a half life of approximately 3.01x10⁵ years, has become an important radionuclide with which to study old ground water. Although ³⁶C1 is primarly produced in the atmosphere, a significant production of ³⁶C1 exists in the subsurface by the activation of ³⁵C1 by thermal neutrons. Subsurface production, if not taken into consideration, will contribute to an error in ³⁶C1 determinations of apparent ages. This thesis reports the results of a study of subsurface production of ³⁶C1 in ground water as it relates to ground—water dating by evaluating the production of neutrons below the surface. Subsurface neutron flux measurements were made in various geologic materials and at various depths below the surface. Neutron production values were calculated and compared to Feige's estimates of neutron production. In addition, neutron production rates were compared to measured values of ³⁶C1 in very old ground water where ³⁶C1 concentrations are near equilibrium. The significance of ³⁶C1 production by neutron activation of ³⁵C1 with respect to ground—water dating, will depend on the age of the ground water and the magnitude of neutron production. Subsurface contributions, therefore, are important to consider in order to reduce uncertainties to acceptable limits.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Radioisotopes in hydrology.; Groundwater -- Dating.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Davis, Stanley N.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleSubsurface neutron production and its impact on ³⁶C1 ground-water datingen_US
dc.creatorKuhn, Mark William.en_US
dc.contributor.authorKuhn, Mark William.en_US
dc.date.issued1984en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstract³⁶Cl, with a half life of approximately 3.01x10⁵ years, has become an important radionuclide with which to study old ground water. Although ³⁶C1 is primarly produced in the atmosphere, a significant production of ³⁶C1 exists in the subsurface by the activation of ³⁵C1 by thermal neutrons. Subsurface production, if not taken into consideration, will contribute to an error in ³⁶C1 determinations of apparent ages. This thesis reports the results of a study of subsurface production of ³⁶C1 in ground water as it relates to ground—water dating by evaluating the production of neutrons below the surface. Subsurface neutron flux measurements were made in various geologic materials and at various depths below the surface. Neutron production values were calculated and compared to Feige's estimates of neutron production. In addition, neutron production rates were compared to measured values of ³⁶C1 in very old ground water where ³⁶C1 concentrations are near equilibrium. The significance of ³⁶C1 production by neutron activation of ³⁵C1 with respect to ground—water dating, will depend on the age of the ground water and the magnitude of neutron production. Subsurface contributions, therefore, are important to consider in order to reduce uncertainties to acceptable limits.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshRadioisotopes in hydrology.en_US
dc.subject.lcshGroundwater -- Dating.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineHydrology and Water Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairDavis, Stanley N.en_US
dc.identifier.oclc213358907en_US
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