Health Effects of Radiation:
5 Themes
Living

(iii) Comparison to other regional ambient dose rates

Comparing the ambient dose rates shown here for 4 municipalities in Fukushima Prefecture and other major cities inside and outside of Japan shows that as a result of decontamination efforts and physical attenuation of radioactive materials, the levels are roughly the same.

Measurement results for ambient dose rates in major cities

Measurement results for ambient dose rates in major cities
Source:
Created based on Japan National Tourism Organization data
(https://www.jnto.go.jp/eq/eng/04_recovery.htm, as of December 2018)

This diagram shows the ambient dose rate measurement results for major cities in Japan and other parts of the world. This shows that the radiation dose varies from region to region.
Variations in the amount of ground radiation are mainly due to differences in the soil and rocks composition.

For more information about ambient dose rate measurement results for major cities,
see page 70 of Vol. 1, FY2017 edition (available in Japanese only).