ORISE Health Studies helping to resolve the “radiation risk debate”

A recent article in Science, one of the world’s most influential scientific journals, has reignited a long-running debate in radiation science: How much radiation protection is enough?

The article, titled “Resolving the Radiation Risk Debate,” was published April 23, 2026, and examines renewed national attention on the “linear no-threshold” (LNT) model, which assumes that any amount of radiation exposure, no matter how small, carries some risk. While LNT has long guided radiation protection standards, scientists continue to debate whether it accurately reflects biological reality at very low doses. With policymakers reconsidering regulatory approaches, Science calls for more robust data, broader expert review, and renewed investment in research to clarify low-dose radiation risk. 

Among the key research efforts highlighted by Science includes the Million Person Study, one of the largest and most comprehensive investigations of chronic, low-dose occupational radiation exposure ever undertaken. This retrospective cohort study follows one million U.S. workers and veterans, combining data from more than 30 cohorts – including DOE workers, nuclear power plant employees, Manhattan Project-era workers, and others – to evaluate long-term health outcomes.

Since the study’s inception, ORISE Health Studies staff have been instrumental in shaping and advancing the research. For example, the Million Person Study leverages ORISE’s extensive epidemiologic data assets, including the Comprehensive Epidemiologic Data Resource, the DOE Radiation Exposure Monitoring System, and the Nuclear Regulatory Commission’s Radiation Exposure Information and Reporting System. Collectively, these systems capture more than 75 years of occupational radiation exposure data dating back to 1942. Just as important, ORISE brings deep institutional knowledge of DOE operations, radiation dose assessment, and advanced biostatistical modeling.

ORISE Health Studies Director Ashley Golden, Ph.D., serves as the Epidemiology Lead for the DOE cohorts within the Million Person Study. In this role, she provides scientific and technical oversight while ensuring alignment between DOE and non-DOE components of the broader effort. ORISE Epidemiologist Sara Howard, Ph.D., supports the effort through study design, statistical analysis, and data management.

In the most recent Million Person Study publication that examines mortality among workers at the Rocky Flats plant, Howard served as primary author, with Golden as corresponding author. The paper was published in the Journal of Radiological Protection as part of a special focus on recent advances in the Million Person Study. 

“As the Science article makes clear, resolving uncertainties around low-dose radiation risk will require stronger data, integrated analyses, and transparent evaluation of competing scientific models. The Million Person Study is designed to provide the statistical power and long-term follow-up needed to address precisely these questions,” said Golden. “No doubt, we are at a time when national conversations about radiation standards are accelerating and ORISE’s decades of data stewardship and scientific leadership will help ensure that decisions around this great debate are grounded in rigorous, evidence-based research.”