Radio-epidemiological analysis of incidence of non-cancer diseases among the Chernobyl liquidators

The work is concerned with assessment of radiation risks for non-cancer diseases among the Chernobyl liquidators from 1986 to 1996. As of 1 January 1999, the Russian National Medical and Dosimetric Registry contains medical and dosimetric data for 174 thousand liquidators. The cohort of 68309 liquidators for whom best verified medical data are available is discussed. The dose dependency of incidence of non-cancer diseases was estimated by the cohort method and using the software package EPICURE. For some classes of non-cancer diseases among liquidators statistically significant estimates of radiation risk were derived for the first time. The highest excess relative risk per 1 Gy was found for cerebrovascular diseases ERR/Gy=1.17 at the 95% confidence interval (0.45; 1.88).