▁locations ). ▁Non eth eless , ▁Ros h yd rom et ▁( the ▁meteor ology ▁service ▁of ▁Russia ) ▁initially ▁announced ▁that ▁the ▁only ▁location ▁in ▁Russia ▁where ▁r uth enium - 1 0 6 ▁was ▁detected ▁was ▁St . ▁Petersburg , ▁from ▁September ▁ 2 5 ▁until ▁October ▁ 7 , ▁in ▁very ▁small ▁quantities . ▁As ▁reported ▁by ▁Ros h yd rom et , ▁Ru - 1 0 6 ▁activity ▁in ▁St . ▁Petersburg ▁was ▁at ▁ 1 1 5 . 4 ▁ μ B q / m 3 ▁from ▁October ▁ 2 ▁to ▁ 6 . ▁ ▁The ▁French ▁Institute ▁of ▁Rad iop rote ction ▁and ▁N uc lear ▁Security ▁( IR SN ) ▁ruled ▁out ▁the ▁em issions ▁as ▁coming ▁from ▁a ▁nuclear ▁re actor , ▁estim ating ▁that ▁it ▁should ▁have ▁come ▁either ▁from ▁a ▁nuclear ▁treatment ▁site ▁or ▁from ▁a ▁center ▁producing ▁radio active ▁medicine . ▁The ▁location ▁where ▁em issions ▁have ▁taken ▁place ▁is ▁estimated ▁south ▁of ▁the ▁U ral ▁mountains , ▁between ▁the ▁Ur als ▁and ▁the ▁Vol ga ▁river , ▁in ▁Russia ▁or ▁Kaz akh stan . ▁ ▁Ros h yd rom et ▁then ▁issued ▁a ▁report ▁describing ▁a ▁rise ▁in ▁beta ▁activity ▁of ▁a eros ols ▁and ▁surfaces ▁at ▁all ▁monitoring ▁posts ▁in ▁South ▁U ral ▁from ▁September ▁ 2 5 ▁to ▁October ▁ 1 , ▁ 2 0 1 7 . ▁In ▁two ▁a eros ol ▁samples , ▁an ▁increase ▁in ▁Ru - 1 0 6 ▁activity ▁was ▁detected . ▁On ▁September