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Cloud immersion building shielding factors for US residential structures.

E D Dickson1, D M Hamby

  • 1United States Nuclear Regulatory Commission, Rockville, USA.

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Summary

Validated building shielding factors for US homes are presented for emergency planning. These factors, crucial for radiological risk assessments, account for realistic housing structures and radioactive material exposure scenarios.

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Area of Science:

  • Nuclear Engineering
  • Radiation Protection
  • Computational Physics

Background:

  • Accurate building shielding factors are essential for emergency planning and risk assessments during radiological events.
  • Contemporary US housing stock requires specific shielding factor data for realistic exposure scenarios.
  • Previous assessments often lacked detailed modeling of diverse housing structures.

Purpose of the Study:

  • To present validated building shielding factors for typical US housing.
  • To support emergency planning and probabilistic risk assessments for radiological events.
  • To provide realistic shielding data for accident mitigation and response planning.

Main Methods:

  • Utilized the Monte Carlo N-Particle (MCNP5) code for detailed computational housing models.
  • Benchmarked calculations with narrow- and broad-beam measurements of common construction materials.
  • Developed scalable shielding models representing primary weather barriers (walls, roofs) of US housing.

Main Results:

  • Calculated floor-specific building shielding factors for various housing types (single/multi-story, with/without basement, manufactured homes).
  • Determined weighted-average shielding factors representative of common US residential structures.
  • Assessed shielding effectiveness of ten common construction materials and ten primary weather barrier models.

Conclusions:

  • The validated shielding factors provide a realistic basis for emergency planning and risk assessment.
  • Computational modeling coupled with experimental benchmarking offers a robust method for determining building shielding.
  • The study addresses a critical data gap for protecting populations in radiological emergencies within diverse housing environments.