NCRP 147 Shielding Calculator

Diagnostic shielding workflows covered

NCRP 147 shielding projects can involve a wide range of diagnostic imaging rooms and adjacent areas. Mosaic is designed to support practical clinical shielding scenarios where geometry, workload, occupancy, and modality-specific assumptions must be documented clearly.

• General radiography rooms
• CT scanner rooms
• Fluoroscopy rooms
• Angiography and cardiac catheterization suites
• Interventional imaging rooms
• Radiographic/fluoroscopic rooms
• Dental or smaller diagnostic X-ray scenarios where appropriate project assumptions are defined
• Adjacent offices, corridors, control rooms, waiting areas, and occupied spaces

From floorplan to barrier recommendations

Mosaic allows users to work directly from the facility floorplan, define barriers and control points, assign occupancy factors and shielding materials, and calculate recommended shielding thicknesses.

• Upload and work from floorplans
• Define walls, doors, floors, ceilings, and other barriers
• Assign occupancy factors and controlled/uncontrolled area assumptions
• Review calculated and recommended shielding values
• Edit final recommendations before generating reports

Transparent calculation documentation

Shielding calculations are only useful if they can be reviewed. Mosaic generates documentation that preserves the assumptions, intermediate steps, and results needed for internal review, peer review, and regulator-facing submissions.

• Barrier summaries
• Distance and occupancy assumptions
• Air kerma and design goal documentation
• Recommended shielding thicknesses
• Step-by-step physicist calculation trace

Why use software instead of spreadsheets?

Spreadsheets can work for simple projects, but they are difficult to audit, hard to standardize across teams, and disconnected from floorplan geometry. Mosaic keeps the project, geometry, assumptions, calculations, and documentation in one workflow.