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“Radiation exposure risks” of driving down Japan National Route 6
(February 28, 2016)

Radiation dosimeter is a device used to measure air radiation dose rate,
which is the level of radiation exposure received while spending 1 hour in
the measures of location.
The actual exposure dose is estimated by multiplying the air dose rate by the
duration of time spent. This means that we can reduce the total radiation
dose by shortening the time spent even in locations with a high air dose rate.
　
For example, the radiation exposure received while driving through Japan
National Route 6 near Fukushima Daiichi Nuclear Power Station for 40km from
Naraha-machi to Minami-Soma City is approximately 1.2 microsieverts
(measured in 2014).
It is less than 1/50th of the amount of exposure received from a chest X-ray
and is less than 1/100th of the radiation exposure received during a
round-trip flight between Narita Airport and the United States.

The exposure dose will be even lower if you drive through Joban Highway,
a road that is even more distant from the power plant than Japan National
Route 6.
The extent of the total exposure dose determines the health impacts of
radiation exposure.
The example of Japan National Route 6 demonstrates that you will not
receive a high level of radiation exposure simply from passing through a
place with high air dose rates.

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