(Image provided by a teacher)
FUKUSHIMA—Radioactive cesium levels exceeding 100,000 becquerels per kilogram were measured in mud accumulated at the bottom of swimming pools at two high schools in and around Fukushima city.
Mud in the pool of a third high school in Minami-Soma, which is closer to the crippled Fukushima No. 1 nuclear plant, showed at least 8,000 becquerels per kilogram.
Under a special measures law, the central government must remove mud and other substances with radioactivity levels of more than 8,000 becquerels caused by the meltdowns at the plant.
The three high schools have not discharged the water from their swimming pools since the nuclear crisis started on March 11, 2011. The water has apparently blocked the spread of contamination from the mud; air radiation levels near the three school pools are almost the same as those of other locations.
“Mud under the water, even if highly contaminated, would not become an issue unless it was taken out of the water,” said Kunikazu Noguchi, an associate professor of radiation protection at Nihon University.
The Asahi Shimbun obtained the mud with the help of the three schools and teachers, and had the Citizen's Radioactivity Measuring Station (CRMS), a Fukushima-based nonprofit group, measure the radioactivity levels.
In March 2012, the CRMS tested mud collected from the pool of the high school in Fukushima. The radioactive cesium level was
65,900 becquerels, according to the results released on April 1 this year.
The prefectural government has measured radioactivity levels of water in the school pool, but not the mud. The latest results for mud from the high school swimming pool in Fukushima showed
104,100 becquerels per kilogram.
http://ajw.asahi.com/article/0311disaster/fukushima/AJ201304220072
