Fukushima evacuees will be returning to a still contaminated zone
Decontamination needed even after residents return, The Yomiuri Shimbun, 10 April 12, If decontamination work does not continue for a certain period in areas highly contaminated by radioactive substances from the Fukushima No. 1 nuclear power plant, returning residents will be exposed to at least 100 millisieverts of accumulated radiation over 30 years, the Science Council of Japan said Monday.
An accumulated radiation level of over 100 millisieverts increases the mortality risk from cancer by 0.5 percent. The council estimated how radiation exposure would change over 30
years, looking at the level before residents were evacuated, the annual level when they return and the existence or lack of decontamination work.
It found residents would likely be exposed to nearly 250 millisieverts
of radiation over 30 years if they return home when the annual
radiation exposure level drops to 20 millisieverts and decontamination
work does not continue, even if radioactive decay is taken into
If residents return home when the annual radiation exposure level
drops to 10 millisieverts and decontamination work does not continue,
they likely would be exposed to more than 100 millisieverts over 30
However, if decontamination work continues for five years after
residents return home following a drop to 10 millisieverts, the likely
radiation exposure level drops to 80 millisieverts.
“It’s necessary to make plans to continue decontamination and to
sufficiently control radiation exposure after residents return home,”
said Fumiko Kasuga, a vice president of the council….
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