The Tokyo metropolitan government has begun measuring radiation levels at 100 locations, to provide accurate information in the wake of the Fukushima nuclear accident.
The action comes after some individuals and municipalities found higher local radiation levels than those released by the metropolitan government.
The metropolitan government currently measures radiation levels at a 19-meter high monitoring post on the roof of a building in Shinjuku ward, central Tokyo, and releases the data to the public.
But it decided to make a more detailed assessment of radioactivity across Tokyo, by taking measurements near the ground.
On the first day of the survey on Wednesday, officials measured radiation levels at a park in Toshima ward.
The measurements were made at 5 centimeters and one meter above the ground, and the readings were 0.07 and 0.06 microsieverts per hour respectively. The figures were about the same level as the readings at the monitoring post in Shinjuku.
The Tokyo metropolitan government plans to finish measurements at 100 locations in about a week, and post the data on its website.
From next Monday it will also lend radioactivity counters to wards and cities across Tokyo.
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