Overview of the Fernald Dosimetry Reconstruction Project and source term estimates for 1951-1988

Area of Science:

• Environmental Science
• Nuclear Chemistry
• Public Health

Background:

• The Feed Materials Production Center (FMPC) processed uranium and thorium, releasing radionuclides into the environment.
• Historical operations included significant releases of uranium particulates and radon from radium-bearing residues.
• Previous assessments lacked comprehensive public impact evaluations.

Purpose of the Study:

• To reconstruct environmental releases of radionuclides from the FMPC (1951-1988).
• To evaluate the impact of these releases on public radiation doses.
• To develop and validate models for environmental transport and dose calculation.

Main Methods:

• Historical record review and interviews with employees and residents.
• Estimation of radioactive material releases to air, water, and groundwater.
• Development of environmental transport models and radiation dose calculation methodologies.
• Evaluation of environmental monitoring data for validation.

Main Results:

• Largest uranium releases to air and water occurred in the 1950s and 1960s.
• Elevated radon releases persisted through the 1970s.
• Atmospheric pathways were identified as the dominant contributors to public radiation dose.

Conclusions:

• The Fernald Dosimetry Reconstruction Project successfully estimated historical radionuclide releases and their environmental impact.
• Atmospheric transport modeling and release estimations are crucial for assessing public health risks.
• The study provides a foundation for understanding long-term environmental consequences of nuclear material processing.