New project: finding hot spots in the communities in Fukushima

Almost 2 years after the onset of the Fukushima nuclear crisis in 2011, our life with the danger of long-term low dose radiation exposure has only just begun.


We need to watch closely the external radiation doses, with renewed caution. The background radiation levels may have fallen in Fukushima, partly due to decay of cæsium 134 with a half life of about two years, but some residents have become complacent. However, investigations by independent groups of citizens and scientists have exposed fabrication of data through manipulation of air dose monitoring posts by the authorities in an attempt to indicate lower radiation risks.

Fukushima Network for Saving the Children from Radiation has launched a new radiation monitoring project, which provides second-to-second air dose radiation data on a map. We will use the "Hotspot Finder", a GPS automatic air dose monitoring, recording and mapping technology. Hotspots are locations where the air doses are considerably higher than the surrounding areas. They are often created through concentrations of radioactive nuclides by the movement of water and wind. The current monitoring system by the authorities is not designed to detect such hotspots.


Our "Hotspot Finder", the high-performance radiation detection system connected with GPS, records radiation dose and location information every second while on the move (in a car or on foot), allowing real-time contamination maps to be compiled with ease.


Contamination maps showing hotspots are available on our website.


Kazuhide Fukada, Information Department of Fukushima Network for Saving Children from Radiation

This article is an extract from Dec 2012 issue of “Tangara”, monthly newsletter of Fukushima Network

Results of investigation

1.059μSv/h At a children's play ground in Fukushima City
1.059μSv/h At a children's play ground in Fukushima City
0.858μSv/h A park in Fukushima City
0.858μSv/h A park in Fukushima City

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