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Fukushima: An invisible enemy

A Geiger counter, measuring a radiation level of 0.442 microsievert per hour, is seen at a park in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

A Geiger counter, measuring a radiation level of 0.442 microsievert per hour, is seen at a park in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

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Children bow to greet their nursery school teacher as they get into a school bus heading to the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

Children bow to greet their nursery school teacher as they get into a school bus heading to the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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A man uses a roller near a Geiger counter, measuring a radiation level of 0.207 microsievert per hour, during nuclear radiation decontamination work at a park in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

A man uses a roller near a Geiger counter, measuring a radiation level of 0.207 microsievert per hour, during nuclear radiation decontamination work at a park in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

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A girl runs past a geiger counter, measuring a radiation level of 0.122 microsievert per hour, upon her arrival at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

A girl runs past a geiger counter, measuring a radiation level of 0.122 microsievert per hour, upon her arrival at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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Children play at an indoor playground facility in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

Children play at an indoor playground facility in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

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Paper crafts of Japanese ornamental "hina" dolls, made by children, are displayed on a wall at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

Paper crafts of Japanese ornamental "hina" dolls, made by children, are displayed on a wall at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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Children play at an indoor sand pit of the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

Children play at an indoor sand pit of the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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Children play at an indoor sand pit of the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

Children play at an indoor sand pit of the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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A girl opens the door of a teacher's staff room at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

A girl opens the door of a teacher's staff room at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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Two-year-old Sakuya Zui plays at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

Two-year-old Sakuya Zui plays at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

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One-year-old Daichi Toyota plays with his mother at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

One-year-old Daichi Toyota plays with his mother at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

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Children play dodge ball in a playroom at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

Children play dodge ball in a playroom at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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A boy plays with a paper plane at the corridor of the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

A boy plays with a paper plane at the corridor of the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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Four-year-old Iori Hiyama rides a tricycle at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

Four-year-old Iori Hiyama rides a tricycle at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

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Two-year-old Nao Watanabe plays in a ball pit at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

Two-year-old Nao Watanabe plays in a ball pit at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

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Two-year-old Sakuya Zui plays at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

Two-year-old Sakuya Zui plays at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

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Children play dodge ball in a playroom at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

Children play dodge ball in a playroom at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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A child walks past a geiger counter, measuring a radiation level of 0.162 microsievert per hour, at a square in front of Koriyama Station in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture March 1, 2014. REUTERS/Toru Hanai

A child walks past a geiger counter, measuring a radiation level of 0.162 microsievert per hour, at a square in front of Koriyama Station in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture March 1, 2014. REUTERS/Toru Hanai

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A girl wearing a mask sits in a school bus heading to the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

A girl wearing a mask sits in a school bus heading to the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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A doctor conducts a thyroid examination on five-year-old girl as her older brother and a nurse take care of her at a clinic in temporary housing complex in Nihonmatsu, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

A doctor conducts a thyroid examination on five-year-old girl as her older brother and a nurse take care of her at a clinic in temporary housing complex in Nihonmatsu, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. REUTERS/Toru Hanai

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Five-year-old Atsunori Kaneta smiles at his home in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

Five-year-old Atsunori Kaneta smiles at his home in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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Seven-year-old Masyoshi Kaneta plays Nintendo Wii U game at a living room of his home in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

Seven-year-old Masyoshi Kaneta plays Nintendo Wii U game at a living room of his home in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. REUTERS/Toru Hanai

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