Cloud immersion building shielding factors for US residential structures

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.