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Radiation levels in the prefecture 

Current location Fukushima Revitalization Information Portal Website > Radiation monitoring information/basic knowledge of radiation > List of archived articles > Radiation levels in the prefecture 
To print view 2019年3月8日更新

The air radiation dose rates within the prefecture have significantly decreased since April, 2011.

Changes in radiation doses

Air radiation dose rate map for the entire Fukushima Prefecture, based on Fukushima Prefecture's environmental radiation monitoring mesh survey results

                                                                                                                                                          Fukushima radiation dose rates map

Influence of radiation in everyday life 

Comparison with global data

Image:Comparison with global data

Japanese major cities (unit μSv/h)

The city name (atomic energy regulation agency data)
Sapporo, Hokkaido 0.03 2019.3.5
Tokyo 0.04 2019.3.5
Fukuoka 0.06 2019.3.5

Overseas major cities (unit μSv/h)

The city name (data:Japan National Tourism Organization)
New York 0.05 2018.1.23
Paris 0.04 2017.10.15
Beijing 0.07 2018.1.25
Seoul 0.12 2018.1.25
Singapore 0.10 2018.1.24

Fukushima Prefecture's radioactivity measurement map


The Fukushima Prefecture's radioactivity measurement map is updated with every new measurement. (The data obtained by monitoring posts and real-time dosimeters are updated daily.)


Instrument and method for measuring radiation

Monitoring post

Photo : Monitoring post

In total, 629 monitoring posts have been placed at public facilities in the prefecture to monitor changes in air dose rates.

Real-time dosimeter


Mainly to monitor the radiation dose rates in areas frequented by children, 2,996 units are installed in the prefecture's schools, childcare centers, parks, etc.

Mobile monitoring

Photo : Mobile monitoring

Places where many people gather, such as tourist spots and meeting places, are measured with a survey meter once a year (twice a year for tourist spots).

Survey from vehicle

Photo : Survey from vehicle

A car equipped with a radiation meter with GPS functions is used to measure the radiation dose rate in the air over a specified driving route. Some route buses are also equipped with such units to regularly conduct measurements.

Radionuclide analysis

Photo : Radionuclide analysis

The amounts of radioactive substances contained in dust, particles (floating dust), falling matters, soil, etc. are being surveyed.


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