A big present from my home town Yokohama to the world.
This is the measurement result of Strontium 90.
Strontium 90 195 Bq/Kg
Sample 605 g
Dust on the roof of an apartment in Kouhokuku Yokohama
Below is the bonus.
Cesium-134 29,775 Bq/Kg
Cesium-137 33,659 Bq/Kg