Radiation Yokohama is down for a change
If you enjoyed the data, thank you. The wrecked Fukushima nuclear power plant appears to be cooling down and in the past months I noticed no major new releases of radioactive pollution. Many vigilant people use their Geiger counters and dosemeters to locate hotspots and some that were found have no relation to the disaster at Fukushima.
Strontium that was measured in some places is normal for nuclear accident releases. Similar to what was deposited in Southern Germany from Chernobyl Strontium-90 (Summary in German) contributes about 1% of the activity of Cesium-137 and 134.
For ease of use I plan to replace the graph with a single value, easier to read than interpreting the up and down of the random event that radiation is at short sample times. I hope to get the software play nice with the data aggregation site at pachube.com