Senior Nuclear Engineer / Health Physicist

Arrotek Medical Ltd; Buford (GA); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Competitive benefits

Job summary

Theragenics is seeking a Senior Nuclear Engineer/Health Physicist to lead radiation engineering efforts in radiopharmaceutical manufacturing. You will design, model, and optimize shielding, dose calculations, and regulatory readiness across multiple facilities and teams to ensure safe, compliant operations.

The role emphasizes Monte Carlo transport modeling, HPGe spectroscopy, and collaboration with Engineering, Manufacturing, Quality, and Regulatory Affairs to advance innovative cancer

Qualifications

• MS/PhD in Nuclear Engineering, Health Physics, Nuclear Physics, Medical Physics, or related field.
• Minimum 5 years of radiation engineering and shielding design experience.
• Proficient with MCNP or similar Monte Carlo transport software.
• Experience with shielding analyses and dose calculations.
• Strong written and verbal communication skills.
• Ability to collaborate across multidisciplinary teams.

Responsibilities

• Perform radiation shielding analyses and dose assessments.
• Develop and validate MCNP models for transport simulations.
• Support facility, hot cell, and radiological system design.
• Assist commissioning, qualification, and manufacturing readiness.
• Prepare calculations, reports, and engineering specifications.
• Evaluate radiation detection systems including HPGe spectroscopy.
• Contribute to design reviews and risk analyses.
• Support regulatory submissions and audits.
• Drive radiation safety and process improvements.

Skills

5+ years of radiation engineering

Strong analytical and problem-solving

Excellent technical writing

Cross-functional collaboration

Education

M.S. or Ph.D. in Nuclear Engineering or Health Physics

Tools

MCNP

MicroShield

SCALE

PHITS

FLUKA

Geant4

MAVRIC

Job description

• Experience utilizing HPGe gamma spectroscopy.

Join Theragenics as a Senior Nuclear Engineer / Health Physicist and help advance the future of radiopharmaceutical manufacturing. In this impactful role, you’ll serve as the primary radiation engineering expert supporting the development of next-generation technologies used in life‑saving cancer treatments. From facility design and radiation modeling to regulatory support and manufacturing readiness, you’ll play a vital role in bringing innovative healthcare solutions to patients worldwide. If you’re passionate about applying advanced nuclear engineering principles to real‑world challenges, this is your opportunity to make a meaningful difference.

Company Overview

At Theragenics, we’re passionate about transforming healthcare and enhancing patient outcomes. Our commitment to innovation drives us to push the boundaries of what’s possible, ensuring a brighter future for patients everywhere. Theragenics is a leader in developing medical devices that focus on minimally invasive treatments for cancer, vascular interventions, and surgical applications. Headquartered in Atlanta, Georgia, with facilities in Costa Rica, Texas, and Massachusetts, Theragenics proudly operates Arrotek, a premier medical device design consultancy in the U.S. and Ireland dedicated to pioneering solutions that improve lives.

Role Summary

As a Senior Nuclear Engineer / Health Physicist, you’ll play a pivotal role in supporting the design, development, commissioning, and operation of innovative radiopharmaceutical manufacturing technologies. Working closely with cross‑functional teams across Engineering, Manufacturing, Quality, Validation, Process Development, and Regulatory Affairs, you’ll apply advanced radiation engineering expertise to ensure safe, compliant, and efficient operations.

Key Responsibilities

• Perform radiation shielding analyses, dose assessments, and source term calculations.
• Develop, validate, and interpret Monte Carlo radiation transport models using MCNP or equivalent software.
• Support facility, hot cell, process equipment, and radiological system design activities.
• Provide radiation engineering expertise during commissioning, qualification, and manufacturing readiness initiatives.
• Prepare engineering calculations, technical reports, design specifications, and engineering standards.
• Evaluate and optimize radiation detection systems, including HPGe spectroscopy applications.
• Participate in design reviews, hazard analyses, and project risk assessments.
• Support regulatory submissions and provide technical expertise during inspections and audits.Collaborate with multidisciplinary teams to solve complex technical and operational challenges.
• Drive continuous improvement initiatives related to radiation safety, facility performance, and operational effectiveness.

Qualifications & Skills

Required Qualifications

• M.S. or Ph.D. in Nuclear Engineering, Health Physics, Nuclear Physics, Medical Physics, or a related discipline.
• 5+ years of experience in radiation engineering, shielding design, health physics, or nuclear engineering environments.
• Demonstrated proficiency with MCNP or equivalent Monte Carlo radiation transport software, including model development and results interpretation.
• Experience performing shielding analyses, source term development, and radiation dose calculations.
• Strong analytical and problem‑solving skills.
• Excellent technical writing, documentation, and communication abilities.
• Ability to effectively collaborate across multidisciplinary teams.

Preferred Qualifications

• Experience in radiopharmaceutical manufacturing or isotope production environments.
• Knowledge of cyclotron facility operations and radiation systems.
• Experience utilizing HPGe gamma spectroscopy.
• Familiarity with cGMP‑regulated manufacturing environments.
• Experience supporting NRC or Agreement State licensed facilities.
• Experience with radiation transport and shielding software such as MicroShield, SCALE, PHITS, FLUKA, Geant4, MAVRIC, or similar tools.

Why Join Us?

Career Growth

Expand your expertise while working on highly specialized nuclear engineering projects within a growing organization focused on innovation and advancement.

Innovative Projects

Contribute to the development of next‑generation radiopharmaceutical manufacturing technologies that directly impact patient care.

Collaborative Culture

Work alongside talented professionals across engineering, manufacturing, quality, regulatory affairs, and process development in a supportive team environment.

Competitive Benefits

• Enjoy a comprehensive benefits package designed to support your health, well‑being, and professional success.

Purpose‑Driven Work

Help create the technologies and therapies that improve outcomes for cancer patients and make a lasting difference in healthcare.