Material
Selection of nuclear installationsWe studied the main sites operating in 1985 (Anonymous, undated, 1992(Anonymous, undated, , 1993. Figure 1 shows the 13 sites selcted, with the year in which each installation started operating and the nature of the activity. Next to the Tricastin site, a uranium enrichment factory (Pierrelatte) starud operating in the early 1960s, and is still in operation. As the main source of pollution in the uranium enrichment factory is chemical, this site was not studied until the Tricastin nuclear reactor came into operation.