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Cancer mortality risk among workers at the Mayak nuclear complex
N S Shilnikova1, D L Preston, E Ron
1Southern Urals Biophysics Institute, Ozyorsk, Russia.
Radiation Research
|May 20, 2003
Summary
This study found that protracted gamma radiation exposure significantly increased cancer risks in Russian nuclear workers. Leukemia risk was highest when exposure occurred shortly before death, while solid cancer risks showed a nonlinear dose response.
Area of Science:
- Radiation epidemiology
- Occupational health
- Cancer risk assessment
Background:
- Limited data exists on cancer risks from protracted, low-dose-rate radiation exposure.
- Previous studies often had low statistical power due to low cumulative doses.
Purpose of the Study:
- To evaluate cancer risks from protracted external whole-body gamma radiation exposure at high cumulative doses.
- To assess risks in a cohort of Russian nuclear workers at the Mayak complex.
Main Methods:
- Followed a cohort of ~21,500 nuclear workers (1948-1997).
- Used excess relative risk models to estimate solid cancer and leukemia risks.
- Adjusted for the effects of plutonium exposures.
Main Results:
- Both solid cancer and leukemia death rates significantly increased with gamma-ray dose.
- Solid cancer dose-response appeared nonlinear, with higher risks at <3 Gy than predicted by linear models.
- Leukemia risk was strongly dependent on time since exposure, with higher risk for recent exposures.
Conclusions:
- Protracted external gamma-ray exposure significantly increased risks of solid cancers and leukemia in nuclear workers.
- Cancer risks at doses <1 Gy may be lower than those from acute exposures.
- Further refinement of dose estimates will improve risk assessment for protracted exposures.