Location: Yokohama, Tsuzuki-ku. Time base: 600 seconds (10 minutes).
Updated a few times per hour. To see latest, refresh your browser window.
Transferred by Zscreen software screenshot from a Windows 7 home system, found not stable, sorry. Latest 10 minutes reading
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
Most simple Geiger counters, as used on this site and in many places, are good for a warning to stay indoors in case of black rain from nuclear fallout. Sensitive as they may be, they are hardly sensitive enough to quickly and reliably detect the small additional activity within the normal background radiation to isolate the contribution from a ground or food sample. It usually takes heavy shielding and good spectrometry to tell that story truthfully.
Relative radiation risk… Recently, we get a lot of radiation values in our news streams and very few have comparison data to estimate: is this normal, elevated, severe or hazardous? Distrust and panic may result. Here, I aim to provide a bit of grounding.
This is a volunteer activity, went on-line 2011-08-27. Maintaining the 24h and 28d graphs for now. Others discontinued. Aiming to make the data more re-usable
System is still in experimental phase, may not be available at times.
Compare with other sites, draw your own conclusions.
24 hours
Click to enlarge. Image updated a few times per hour. Reload page to see changes.
Data graphing started 2011-08-27 may be discontinued
Working with the radiation data acquisition and graphing software AW-RADW turned out OK for this graphic display but the combination with batch files reminded me of a temporary career step as an IT Network admin 20 years ago. In other words, I did not get it to run, reliably. The combined software takes more than 10 minutes to update 5 4 graphs so every second run does not start because the prior instance has not yet finished. All the data points are there, only the update is infrequent.
What’s more, data released as graphic do not join private sector initiative maps, such as safecast.org or the map by the Institute for Information Design, Japan.
Cloud to the rescue
Finding many radiation counters in Japan on maps with data streams pointing to Pachube.com, I decided to give that a try. This meant a new set of batch files, to start the application AW-RADW, tell it to write to an ASCII file every 10 minutes and put the value to a pachube data stream. More to come as I learn the basics.
Update: maintaining only the 24h and 28d graph.
This is a volunteer activity, went on-line 2011-08-27.
System is still in experimental phase, may not be available at times.
Compare with other sites, draw your own conclusions.
6 hours
Click to enlarge. Image updated a few times per hour. Reload page to see changes.
Radiation Monitor Yokohama, Tsuzuki-ku 