Integrating workplace exposure databases for occupational medicine services and epidemiologic studies at a former nuclear weapons facility

Our plain-English summary of Integrating workplace exposure databases for occupational medicine services and epidemiologic studies at a former nuclear weapons facility, by A.J. Ruttenber, J.S. McCrea, T.D. Wade, et al (Applied Occupational and Environmental Hygiene, 2001).

The study

• Authors: A.J. Ruttenber, J.S. McCrea, T.D. Wade, M.F. Schonbeck, A.D. LaMontagne, M.V. Van Dyke, J.W. Martyny
• Journal: Applied Occupational and Environmental Hygiene
• Published: 2001;16(2):192-200
• Cited by: 4 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

We outline methods for integrating epidemiologic and industrial hygiene data systems for the purpose of exposure estimation, exposure surveillance, worker notification, and occupational medicine practice. We present examples of these methods from our work at the Rocky Flats Plant--a former nuclear weapons facility that fabricated plutonium triggers for nuclear weapons and is now being decontaminated and decommissioned. The weapons production processes exposed workers to plutonium, gamma photons, neutrons, beryllium, asbestos, and several hazardous chemical agents, including chlorinated hydrocarbons and heavy metals. We developed a job exposure matrix (JEM) for estimating exposures to 10 chemical agents in 20 buildings for 120 different job categories over a production history spanning 34 years. With the JEM, we estimated lifetime chemical exposures for about 12,000 of the 16,000 former production workers. We show how the JEM database is used to estimate cumulative exposures over different time periods for epidemiological studies and to provide notification and determine eligibility for a medical screening program developed for former workers. We designed an industrial hygiene data system for maintaining exposure data for current cleanup workers. We describe how this system can be used for exposure surveillance and linked with the JEM and databases on radiation doses to develop lifetime exposure histories and to determine appropriate medical monitoring tests for current cleanup workers. We also present time-line-based graphical methods for reviewing and correcting exposure estimates and reporting them to individual workers.

In plain English

This was a methods paper, not a disease study. The authors described linking exposure databases at Rocky Flats Plant, a former nuclear weapons facility (production 1951 to 1989). Workers were exposed to plutonium, gamma photons, neutrons, beryllium, asbestos and hazardous chemicals. Asbestos and several other agents had usually not been measured before. Using job records, worker interviews and published exposure levels, the authors built a job exposure matrix covering chemicals and asbestos. With it they estimated lifetime chemical exposures for about 12,000 of 16,000 former production workers. Former workers were selected for medical screening using cut-offs of 10 percent of ACGIH Threshold Limit Values or of an estimated lowest observable effect level. They designed a surveillance system for current cleanup workers, not yet linked to occupational medicine records. The combined database listed asbestos exposures for each production worker by year, but the article printed none of these values and reported no health outcomes. Its only asbestos figures were zero entries for a hypothetical worker. The authors concluded such a system would not be fully used without support at all levels.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Methods and experience report describing the design and integration of exposure databases (a job exposure matrix, an exposure surveillance system, and occupational medicine records). It is not an epidemiologic study of health outcomes.
• Who was studied: Workers at the Rocky Flats Plant, a U.S. nuclear weapons facility, during the 1951–1989 production period (about 18,000 hired), plus current cleanup workers
• Exposure: Plutonium, gamma photons, neutrons, beryllium, asbestos and several hazardous chemical agents, including chlorinated hydrocarbons and heavy metals. Asbestos was one of the agents in the job exposure matrix, and the combined database listed asbestos exposures for each production worker for each year of employment. The article did not print any of these values for actual workers. The only asbestos figures shown are illustrative zero entries for a hypothetical worker in Table I.
• Main results:
  • The job history database had 113,777 annual entries for workers from 1951 to 1989
  • Organization codes and job titles were grouped into 35 general organization codes (from 8740) and 128 general job codes (from 4308)
  • Industrial hygienists eliminated 10 of the 20 listed chemicals because there was no evidence any workers were exposed to them
  • Exposure estimates were based on published exposure levels for production processes similar to those at Rocky Flats
  • Lifetime chemical exposures were estimated for about 12,000 of the 16,000 former production workers
  • The combined historical database listed chemical, asbestos and radiation exposures for each production worker for each year of employment. The article did not report these values for actual workers.
  • Table I gave illustrative annual exposure estimates from the job exposure matrix for a hypothetical worker. The asbestos entries shown were zero.
  • Criteria for recommending medical screening to former workers were set at 10 percent of ACGIH Threshold Limit Values, or 10 percent of the estimated lowest observable effect level
  • The exposure surveillance system had not been linked with the Occupational Medicine Department's data system
  • Separate clinical and industrial hygiene data systems had prevented exposure data from being integrated into occupational medicine practice at Rocky Flats
• The authors' conclusion: The authors concluded that even a single integrated exposure and occupational medicine data system would not be used to its fullest extent unless it was supported at all levels of authority
• Limitations the authors state:
  • Expressing exposure as a continuous variable based on literature data implies a certainty that does not exist
  • Asbestos and several other agents had usually not been measured in the past
  • Worker records from the production period were incomplete
  • Current monitoring has no guidelines for choosing which workers are sampled or how often

Topics

Medical terms in this study, explained in our Lexicon: Industrial Hygiene, Cumulative Exposure, Medical Monitoring.

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