▁ 2 6 ▁and ▁ 2 7 , ▁Ru - 1 0 6 ▁decay ▁products ▁were ▁detected ▁in ▁the ▁Republic ▁of ▁T atar stan . ▁On ▁September ▁ 2 7 ▁and ▁ 2 8 , ▁high ▁poll ution ▁levels ▁of ▁a eros ols ▁and ▁surfaces ▁was ▁detected ▁in ▁Vol g og rad ▁and ▁Rost ov - on - Don . ▁In ▁two ▁a eros ol ▁samples ▁from ▁Ch ely ab in sk ▁O blast , ▁ 9 8 6 - ▁and ▁ 4 4 0 - fold ▁activity ▁increases ▁were ▁measured , ▁as ▁compared ▁to ▁the ▁preceding ▁month . ▁ ▁The ▁May ak ▁nuclear ▁plant ▁is ▁widely ▁sus pected ▁as ▁the ▁source ▁of ▁the ▁radiation . ▁Author ities ▁at ▁May ak ▁and ▁Ros atom , ▁the ▁Russian ▁state ▁company ▁running ▁the ▁nuclear ▁industry , ▁have ▁both ▁denied ▁a ▁link . ▁ ▁On ▁ 2 1 ▁November ▁ 2 0 1 7 ▁Russia ▁revers ed ▁itself ▁by ▁confirm ing ▁that ▁a ▁radiation ▁sp ike ▁was ▁recorded ▁at ▁two ▁monitoring ▁facilities ▁within ▁a ▁ ▁radius ▁of ▁the ▁May ak ▁nuclear ▁re processing ▁and ▁is ot ope ▁production ▁plant . ▁Russia , ▁however , ▁continues ▁to ▁den y ▁that ▁the ▁source ▁of ▁the ▁radiation ▁is ▁within ▁Russia , ▁and ▁claims ▁that ▁" the ▁published ▁data ▁is ▁not ▁sufficient ▁to ▁establish ▁the ▁location ▁of ▁the ▁poll ution ▁source ." ▁ ▁Ros atom ▁initially ▁stated ▁that ▁it ▁had ▁not ▁carried ▁out ▁any ▁operations ▁that ▁could ▁have ▁led ▁to ▁the ▁is ot ope ' s ▁release ▁into ▁the ▁atmosphere