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Application of the relative uranium-series disequilibrium in soil to locate and/or confirm precisely active fault traces: A new technique.

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Title: Application of the relative uranium-series disequilibrium in soil to locate and/or confirm precisely active fault traces: A new technique.
Authors: LaBrecque, J. J.1 jjlabrec@ivic.ve, Cordoves, P. R.1
Source: Journal of Radioanalytical & Nuclear Chemistry. Sep2003, Vol. 258 Issue 1, p43-48. 6p.
Subjects: Uranium, Radioactive substances, Actinide elements, Transuranium elements, Soil testing, Spectrum analysis
Abstract: Fault traces have been previously located from measurements of 222Rn in soils taken a constant soil-depth across the fault trace. In this paper, we have studied the uranium-series disequilibria of the 226Ra, 222Rn (gas) and 214Bi radionuclides, not only for their horizontal spatial patterns across the fault trace, but also for their vertical spatial patterns near and at the fault trace itself. Radon-222 activities in the soil-gas were measured on-site with a radiation monitor and a Lucas cell. Radium-226 and 214Bi were determined in soil samples in the laboratory by gamma-ray spectroscopy. A new technique employing the measurement of 222Rn versus soil-depth shows a decrease in 222Rn activity at the fault trace due to the much higher soil-gas permeability as a result of the fractured soil, as well as relative larger uranium-series disequilibria, in respect to an increase in 222Rn activity at normal sites, where the soil is not fractured. Finally, it is suggested that fault trace detection could possibly also be performed by measuring 214Bi in surface soils (0-100 cm) along a transect. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Radioanalytical & Nuclear Chemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Application of the relative uranium-series disequilibrium in soil to locate and/or confirm precisely active fault traces: A new technique.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Radioanalytical+%26+Nuclear+Chemistry%22">Journal of Radioanalytical & Nuclear Chemistry</searchLink>. Sep2003, Vol. 258 Issue 1, p43-48. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Uranium%22">Uranium</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactive+substances%22">Radioactive substances</searchLink><br /><searchLink fieldCode="DE" term="%22Actinide+elements%22">Actinide elements</searchLink><br /><searchLink fieldCode="DE" term="%22Transuranium+elements%22">Transuranium elements</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+testing%22">Soil testing</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink>
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  Data: Fault traces have been previously located from measurements of 222Rn in soils taken a constant soil-depth across the fault trace. In this paper, we have studied the uranium-series disequilibria of the 226Ra, 222Rn (gas) and 214Bi radionuclides, not only for their horizontal spatial patterns across the fault trace, but also for their vertical spatial patterns near and at the fault trace itself. Radon-222 activities in the soil-gas were measured on-site with a radiation monitor and a Lucas cell. Radium-226 and 214Bi were determined in soil samples in the laboratory by gamma-ray spectroscopy. A new technique employing the measurement of 222Rn versus soil-depth shows a decrease in 222Rn activity at the fault trace due to the much higher soil-gas permeability as a result of the fractured soil, as well as relative larger uranium-series disequilibria, in respect to an increase in 222Rn activity at normal sites, where the soil is not fractured. Finally, it is suggested that fault trace detection could possibly also be performed by measuring 214Bi in surface soils (0-100 cm) along a transect. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Radioanalytical & Nuclear Chemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1023/A:1026293606102
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      – Code: eng
        Text: English
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      – SubjectFull: Uranium
        Type: general
      – SubjectFull: Radioactive substances
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      – SubjectFull: Actinide elements
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      – SubjectFull: Transuranium elements
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      – SubjectFull: Soil testing
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      – SubjectFull: Spectrum analysis
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      – TitleFull: Application of the relative uranium-series disequilibrium in soil to locate and/or confirm precisely active fault traces: A new technique.
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              Text: Sep2003
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