The study presents an analysis of the influence of the dose and dose rate factor on leukemia incidence in the cohort of emergency workers in six regions of Russia (Northwest, Volgo-Vyatsky, Povolzhsky, Central-Chernozem, North-Caucasus and Urals) in the period from 1986 to 1997. Data supplied from these regions are characterized by reliability and high percentage of annual check-ups for emergency workers (about 86%). A total of 70,699 emergency workers with documented dose (among them 52 leukemia cases) were considered in the radiation risk analysis. The 8 cases diagnosed within 2 years after exposure and 12 diagnosed of Chronic Lymphocytic Leukemia (CLL) were excluded from the study. The number of follow-up person-years in this cohort was 743,845.
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