Seventy thousand people living beyond the 20-kilometer no-go zone around Japan's Fukushima should be evacuated because of radioactivity deposited by the crippled nuclear plant, a watchdog said.
Seventy thousand people living beyond the 20-kilometer no-go zone around
Japan
's
Fukushima
should be evacuated because of radioactivity deposited by the crippled nuclear
plant, a watchdog said.
Updating its assessment of the March 11 disaster,
France
's
Institute for Radiological Protection and Nuclear Safety, known as IRSN,
highlighted an area northwest of the plant that lies beyond the zone whose
inhabitants have already been evacuated.
Radioactivity levels in this area range from several hundred becquerels a
square meter to thousands or even several million becquerels a square meter,
the IRSN report, issued late Monday, said.
Around 70,000 people, including 9,500 children aged up to 14, live in the area,
"the most contaminated territory outside the evacuation zone," the
agency said.
"These are people who are still to be evacuated, in addition to those who
were evacuated during the emergency phase in March," Didier Champion, its
environment director, told AFP.
Staying in this area means the inhabitants would be exposed to radiation of
more than 10 millisieverts in the year following the disaster, according to the
IRSN.
This level is used in French safety guidelines for protecting civilian
populations after a nuclear accident. In
France
, 10
mSv is three times the normal background radiation from natural sources.
"Ten mSv is not a dangerous dose in and of itself, it's more a
precautionary dose," said Champion, noting however that this figure
doesn't include any additional doses from contaminated food or water.
The 10 mSv derives from a calculation of exposure to at least 600,000
becquerels a square meter, emitted by caesium 137 and 134, which are
long-lasting radioactive elements.
Of the 70,000 people in the zone identified in the IRSN report, more than
26,000 could be exposed to doses of more than 16 mSv in the first year after
the disaster.
May 15,
Japan
began
to evacuate 4,000 residents of the village of Iidate-mura and 1,100 people in
the town of
Kawamata-cho
, 30
kilometers from the plant. The two locations had consistently received high
amounts of radioactive dust due to wind patterns.
The IRSN report is based on data for radioactivity reported by the Japanese
authorities and from
U.S.
overflights of the zone.
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