Some measurments of the gamma radiation in Tokyo

My own data

NOTE: Due to other needs for my instrument and the obvious lack of radiation in the air, I am thinking to stop updating this page.

Based on the logs 1, 2 , 3 and processed data from my GAMMA-SCOUT® I have preapred the graph below. It will be updated from time to time (in the morning and in the evening?).

The device was on my balcony on the 3rd floor, Tokyo-to, Minato-ku, Mita 3-7-31 until 2010年03月23日 18:15. After that I moved it inside next to a window due to bad weather.

At the moment the audio alarm for instant doses over 1.0 μSv/h is on, so I should be able to hear it.

The measured values are average per hour or per 10min, in μSv/h (micro Sieverts per hour).

The normal average value for Tokyo is about 0.104 μSv/h.

You can also see all the data so far.

Other data sources

Another independent measurment from Azbu juban is on-line on Denphone's website
Official data from the Japanese government
A map vizualizing crowd-sourced geiger counter readings across Japan
A map vizualizing crowd-sourced geiger counter readings across Japan