Study of thyroid disorders in two Lithuanian regions with different degrees of exposure to radioiodine fallout after the Chernobyl accident

The released radtonuchdes after the Chernobyl accident were transported by moving air masses over Lithuania Of particular importance were radioiodines Measurements of radioactive iodine on the first day after the accident showed that J m concentration in the air was 10 times higher above the normal range The weather resulted different exposure of Lithuanian regions to the fallout (Fig. 1). Measurements of J m in cows' milk at that time showed that it's concentration didn't increase above standard ranges (370 Bq/1) in Central and Northern regions in contrast to 3700±660 Bq/1 in Southern and Western regions In result, mean adults equivalent thyroid doses estimated by determinant method, were 1,2 mSv in Northern regions, 9,1 mSv in Western and Southern regions They were correspondingly 10 mSv and 77 mSv for children [1]