Monte Carlo simulations of neutron well-logging in granite and sand to detect water and trichloroethane (TCA)

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The Monte Carlo code MCNP is used in simulations of neutron well logging in granite to detect water and TCA (C{sub 2}H{sub 3}Cl{sub 3}), a common ground contaminant, in fractures of 1 cm and 1 mm thickness at various distances and orientations. Also simulated is neutron well logging in wet sand to detect TCA and lead (Pb) at various uniform concentrations. The {sup 3}H(d,n) (DT) and{sup 2}H(d,n) (DD) neutron producing reactions are used in the simulations to assess the relative performance of each. Simulations are also performed to determine the efficiency of several detector materials such as CdZnTe, Ge and ... continued below

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46 p.

Creation Information

Hua, D.D.; Donahue, R.J.; Celata, C.M. & Greenspan, E. January 1, 1998.

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  • Hua, D.D. Univ. of California, Berkeley, CA (United States). Dept. of Nuclear Engineering
  • Donahue, R.J.
  • Celata, C.M. Lawrence Berkeley National Lab., CA (United States)
  • Greenspan, E. Univ. of California, Berkeley, CA (United States). Dept. of Nuclear Engineering

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Description

The Monte Carlo code MCNP is used in simulations of neutron well logging in granite to detect water and TCA (C{sub 2}H{sub 3}Cl{sub 3}), a common ground contaminant, in fractures of 1 cm and 1 mm thickness at various distances and orientations. Also simulated is neutron well logging in wet sand to detect TCA and lead (Pb) at various uniform concentrations. The {sup 3}H(d,n) (DT) and{sup 2}H(d,n) (DD) neutron producing reactions are used in the simulations to assess the relative performance of each. Simulations are also performed to determine the efficiency of several detector materials such as CdZnTe, Ge and NaI as a function of photon energy. Results indicate that, by examining the signal from the 6.11 MeV gamma from the thermal neutron capture of Cl in TCA, trace amounts (few ppm) are detectable in saline free media. Water and TCA filled fractures are also detectable. These results are summarized in Tables 7--21. Motivation for this work is based on the need for detection of trace environmental pollutants as well as possible fracture characterization of geologic media.

Physical Description

46 p.

Notes

OSTI as DE98052313

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  • Other Information: PBD: Jan 1998

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  • Other: DE98052313
  • Report No.: LBNL--40866
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/650225 | External Link
  • Office of Scientific & Technical Information Report Number: 650225
  • Archival Resource Key: ark:/67531/metadc710091

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  • January 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 5, 2016, 1:28 p.m.

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Hua, D.D.; Donahue, R.J.; Celata, C.M. & Greenspan, E. Monte Carlo simulations of neutron well-logging in granite and sand to detect water and trichloroethane (TCA), report, January 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc710091/: accessed October 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.