Radiation Shielding Design, Analysis, & Monte Carlo Modeling

ATOM SPEC provides radiation shielding design, evaluation, and computational analysis for facilities and equipment involving gamma, x-ray, beta, and neutron radiation. Our analyses combine recognized health physics principles, engineering judgment, and advanced radiation transport modeling to develop practical shielding solutions that support regulatory compliance, personnel protection, and facility operations.

Whether evaluating an existing installation, designing a new facility, modifying radiation-producing equipment, or planning the removal of radioactive material, ATOM SPEC can provide the technical analysis needed to understand radiation conditions and make informed design decisions.

Radiation Transport Modeling

ATOM SPEC uses advanced computational tools, including Monte Carlo and deterministic radiation transport methods, to evaluate complex shielding configurations that may not be adequately represented by simplified calculations alone.

Modeling capabilities include:

• MCNP 6.3 radiation transport simulations

• PHITS particle and heavy-ion transport modeling

• SCALE shielding, depletion, and activation calculations

• Gamma, x-ray, beta, and neutron transport

• Coupled photon-neutron analyses

• Streaming and penetration evaluations

• Skyshine and scattered-radiation assessments

• Source-term development and validation

• Residual dose and activation calculations

• Sensitivity and design-optimization studies

Computational methods are selected based on the radiation source, geometry, shielding materials, operating conditions, and objectives of the project.

Shielding Design Services

ATOM SPEC supports shielding projects from initial concept through final design verification. Services may include:

• Preliminary shielding calculations

• Shield wall, ceiling, floor, and door design

• Equipment and source-storage shielding

• Beam-port, penetration, and labyrinth evaluations

• Temporary shielding for maintenance or source handling

• Shielding modifications for existing facilities

• Radiation area classification

• Controlled and unrestricted area dose evaluations

• Occupancy and workload assessments

• Design-basis dose-rate calculations

• ALARA design evaluations

• Independent review of vendor or engineering calculations

Shielding recommendations consider more than material thickness alone. Facility layout, source orientation, operating time, occupancy, access control, penetrations, maintenance activities, and credible abnormal conditions may all affect the final design.

Applications

Our shielding design and analysis services can support:

• Gamma and x-ray irradiators

• Blood and research irradiators

• Radiation calibration facilities

• Medical isotope production facilities

• Cyclotrons and particle accelerators

• Industrial radiography installations

• Brachytherapy and radiation therapy systems

• Sealed-source storage areas

• Radioactive material processing facilities

• Laboratories and hot cells

• Nuclear power and fuel-cycle facilities

• Radioactive material packaging and handling operations

• Equipment decommissioning and source-removal projects

Existing Facility Evaluations

Changes in equipment, source activity, workload, occupancy, or facility use can affect the adequacy of an existing shielding design. ATOM SPEC can evaluate current installations to determine whether the shielding remains appropriate for present or proposed operations.

An existing facility assessment may include:

• Review of drawings, calculations, and licensing documents

• Confirmation of source characteristics and operating conditions

• Evaluation of shielding materials and construction details

• Review of penetrations, doors, joints, and potential streaming paths

• Comparison of calculated and measured radiation levels

• Assessment of proposed equipment or operational changes

• Identification of design vulnerabilities or data gaps

• Recommendations for additional shielding or administrative controls

Where field measurements are available, survey data may be used to benchmark the computational model and strengthen confidence in the analysis.

Activation and Decommissioning Analysis

ATOM SPEC also performs activation and residual dose evaluations for facilities and equipment exposed to neutron or high-energy particle fields. These analyses can support material disposition, facility modification, maintenance planning, and decommissioning.

Services may include:

• Neutron activation calculations

• Radionuclide inventory estimates

• Decay and cooldown evaluations

• Residual dose-rate projections

• Component and material activation assessments

• Waste characterization support

• Decommissioning dose assessments

• Worker dose and temporary shielding evaluations

Engineering Deliverables

Each project is documented in a clear technical report appropriate to the scope and intended use of the analysis. Deliverables may include:

• Design assumptions and source-term documentation

• Model geometry and material descriptions

• Computational methods and quality-control checks

• Dose-rate or dose-equivalent results

• Radiation contour plots and three-dimensional visualizations

• Identification of limiting locations and exposure pathways

• Sensitivity and uncertainty considerations

• Shielding recommendations

• Design drawings or shielding specifications, as applicable

• Conclusions suitable for regulatory or engineering review

Calculations are independently reviewed and documented to provide a traceable technical basis for design decisions.

A Practical, Defensible Approach

Radiation shielding analysis should produce more than a theoretical result. It should provide a defensible engineering basis for protecting workers and the public while supporting realistic facility operations.

ATOM SPEC works closely with facility personnel, radiation safety staff, equipment manufacturers, architects, and engineers to develop shielding solutions that are technically sound, constructible, and appropriate for the intended application.

Discuss Your Shielding Project

Contact ATOM SPEC to discuss shielding requirements for a new facility, equipment installation, facility modification, source-handling operation, or decommissioning project. We can review the available information, identify the appropriate level of analysis, and develop a scope tailored to your technical and regulatory needs.

Phone: 865-338-0928
Email: info@atomspecs.com