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Introduction.

  This report is the second phase of a study of the mortality of most workers employed at four Federal nuclear plants in Oak Ridge Tennessee between 1943 and 1984. In the first phase the analysis was limited to white males who were employed only during the World War II era when radiation monitoring programs were in the developmental stages [1]. Workers were assigned a relative radiation exposure index based on job and department codes and were designated as ``probably exposed'' or ``probably non-exposed''. Additional factors considered in the analyses were socioeconomic status, place of employment, length of employment, birth year, and period of follow-up. The place of employment is an important exposure-related variable since the type of radiation exposure was different at each facility. Previous dose-response studies have been limited to subgroups of white males and have excluded individuals that were employed at more than one facility after 1947 [2,3]. Mortality study results for white males employed only at X-10 with follow-up through 1984 have also been reported in combination with populations of workers employed at other Department of Energy (DOE) facilities [4].