"This was a place where children always played around. I'm worried about whether the radiation had any effects on the children," said Shigeru Ono, 74.
Earlier surveyors who dug deeper into the hot spot soil recorded stronger radiation, leading some experts to speculate the tainted soil came from elsewhere and was deliberately buried.
But the ministry confirmed the same day that rainwater is leaching from the ditch and into the soil at the hot spot.
Up to 276,000 becquerels of cesium per kilogram of soil was detected 30 cm below the surface there Friday after abnormally high airborne radiation was detected earlier in the week, the city said.
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