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About 400 protesters, many of the areas around the affected plant, went to the ministry of education and science to demand a rethink on the new limit, which allows exposure of up to 20 millisieverts per year. 

A group of residents of Fukushima submitted a letter to the Minister of Education to require the Ministry to do everything possible to reduce radiation levels in schools and provide financial support. 

Protest organizers said the radiation limit for playgrounds was about six times the legal maximum hourly 0.6 microsievert those under 18 are allowed to work. 

The protesters brandished banners emblazoned with slogans such as "Protect children in Fukushima radiation" and chanted: "Why is 20 mSv? Come Minister!" 

Ministers have defended the increase in the acceptable level of security as a necessary measure to ensure the education of thousands of children in Fukushima Prefecture. 

Minister of Science, Yoshiaki Takaki had said before a parliamentary hearing: "We're always thinking that we should never underestimate the radiation risk." 

"Efforts must be made to avoid possible radiation," he said. 

But the protesters will not be appeased. 

"That is enough. I'm really angry to see that the government has no intention to protect its population," said Ruiko Muto, 57, who had traveled from Miharu town, about 45 kilometers (28 miles) from the floor paralyzed. 

"We're making the claim to protect children, as education authorities of Fukushima follows the guidelines and that outdoor activities can be safe." 

The nuclear crisis remains unresolved and tens of thousands of people still unable to return to their homes, farms and businesses in an area of ​​20 km around the plant, spewing radiation. 

More than 20 primary and secondary schools to 30 km have been forced to close since the accident, which affects about 5,000 students, the daily Yomiuri newspaper reported on Monday.