Research Thrust Areas

“Scientists investigate that which already is. Engineers create that which has never been.”        

– Albert Einstein


The Radiological Engineering, Detection, and Dosimetry (RED²) Laboratory at Georgia Tech is led by Dr. Shaheen Dewji. The RED² Laboratory’s research focuses on harnessing both computational capabilities in Monte Carlo radiation transport modeling and experimental measurements using radiation detection for applications in radiation protection, dosimetry, health physics, and nuclear materials accounting.

Funding Agencies and Collaborators

Research Thrust Areas

Thrust Area 1 – Computational Dosimetry

Research activities include the development of dose coefficients dosimetric and biokinetic models for occupational nuclear workers, members of the public, nuclear medicine, space, defense, and emergency response. Sub-areas include:

      • Age/sex-specific anthropomorphic phantom radiation transport to computer internal and external dose coefficients;
      • Biokinetic modeling from internalized (inhalation, ingestion, wounds) radionuclides from nuclear security, reactor, and environmental source terms;
      • Multi-scale multi physics computational fluid-particle dynamics (CFPD) modeling of physiologically-based dosimetric models;
      • Uncertainty quantification in external and internal dose assessment;
      • Machine learning applications in diagnostic imaging, dose reconstruction, and low dose environmental radiation exposures;
      • Expanded statistical analysis for consequence management and defense.



Uncertainty quantification in dose assessment for nuclear and radiological consequence management.

Physiological comparison of organ depth distribution of stylized and voxel phantom generations.

Thrust Area 2 – Radiation Detection

Research activities include the employment of validation and verification of gamma-ray spectroscopic detector responses. Sub-areas include:



Diagram of the MC-15 neutron multiplicity counter as it is modeled in MCNP6.2.

Thrust Area 3 – Radiation Shielding

Research activities include design specification and optimization using radiation transport simulation, metaheuristic algorithmic optimization, and experimental verification of accelerator-driven sources for radiotherapy, with recent focus on FLASH radiotherapy.


Accelerator shielding design for new accelerator-based radiotherapy modalities.

Thrust Area 4 – Nuclear Safety, Security & Nonproliferation Policy, and Nuclear Knowledge Management

Research activities include evaluation of nuclear safety, security, and nonproliferation policy, including low dose regulation, nuclear safeguards and nonproliferation, emergency response, nuclear forensics, and nuclear knowledge management. Recent activities have focused on technology agnostic advanced reactor licensing risk-informed safety/security and dose-based siting under 10CFR Part 53 (proposed) and 10CFR Part 73 regulatory language.


Lagrangian plume model for SOARCA analysis of Peach Bottom NPP.
Gaussian plume model for SOARCA analysis of Peach Bottom NPP.















Research Overview:

(PDF) Dewji_2023_Slides-Fall-2023-Seminar