137 Cs source. The statistical analysis of the meas- urement results has shown that dose distribution is adequately described by the log-normal function for the population of dif- ferent territories. With allowance for a fixed error, the aver- age doses range from 3 to 5 cGy for the uncontaminated areas and about 12 cGy for the contaminated ones. Residents having accumulated doses much higher the average ones are referred to a risk group and have to be followed up and subjected to dosi- metric investigation. It has been established that there is a clear correlation between the average individual accumulated doses measured by EPR and the level of radioactive contamination of the area. The linear regression coefficient has been found to be 0.24 0.08 cGy (Ci/km 2 ). The dependence of individual doses on age is given by a linear regression with the slope of 0.14 0.05 cGy/year. The indicated relationships are in agreement with re- sults obtained with the models estimating retrospectively the accumulated doses.