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Related Experiment Videos

Borehole parametric study for neutron induced capture gamma-ray spectrometry using the MCNP code.

M Shahriari1, M Sohrabpour

  • 1Physics Department, Amir Kabir University of Technology, Tehran, Iran.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|February 12, 2000
PubMed
Summary

Neutron transport simulations reveal that absorbers with significant epithermal resonances, like tungsten and silicon, can experience substantial resonance captures in dry granite or when neutron poisons are present, impacting neutron flux distribution.

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Area of Science:

  • Nuclear Engineering
  • Geophysics
  • Materials Science

Background:

  • Neutron transport simulations are crucial for understanding subsurface nuclear processes.
  • Granite formations are common geological environments for nuclear applications.
  • Neutron absorbers significantly influence neutron flux and capture rates.

Purpose of the Study:

  • To simulate neutron transport from an Americium-Beryllium (Am-Be) source in granite.
  • To investigate the impact of moisture and neutron poisons on thermal neutron flux.
  • To analyze thermal and nonthermal captures by specific absorbers with resonance structures.

Main Methods:

  • Utilized the MCNP Monte Carlo code for neutron transport simulation.
  • Modeled an Am-Be neutron source within a granite borehole environment.

Related Experiment Videos

  • Calculated neutron flux distribution and capture rates for various absorbers (W, Si).

    • Main Results:

    • Moisture and neutron poisons alter thermal neutron flux distribution.
    • Absorbers with epithermal resonance structures (e.g., W, Si) exhibit significant resonance captures.
    • Resonance captures can be comparable to thermal captures in dry formations or with poisons.

    Conclusions:

    • Neutron capture behavior is energy-dependent and influenced by formation moisture and added poisons.
    • Understanding resonance capture is vital for accurate neutronics in geological formations.
    • The presence of specific absorbers can significantly modify neutronics in subsurface environments.