Hello from Kaliningrad Russia

My name is Alexander.
I'm have Geiger Kit with M4011 tube. buy it on aliexpress after incident in Fukushima.
I did not notice any special events until yesterday, when with the rain this happened

then i has decided to join the community.
my location is 54.6746° / 20.5017°

Welcome. Have you been monitoring with the sensor outside for a long time? Others have noticed this, see the topic here:
http://www.radmon.org/index.php/kunena/experiments/199-wiping-the-car-down
and numerous youtube videos, such as

and

The more credible sources I found say it's mostly naturally occurring Radon gas being washed down, but was it this much before Fukushima? I haven't done enough research to say for sure.

This Geiger kit has been working from 10/2014. It lies on the same place.
Of course, during that time has passed more than one rainy season,
but these readings I have got the first time.
slight raising level when burning peat bogs in the area of Chernobyl in May-June of this year.
but it was very slight increase from the average 20-25CPM to 30-35.