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Report No.
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Investigation on dose rate reduction at Fukushima University Junior High School and Kindergarten

Kurikami, Hiroshi ; Yoshikawa, Hideki; Sasamoto, Hiroshi  ; Iijima, Kazuki ; Zaima, Naoki; Munakata, Masahiro ; Tokizawa, Takayuki; Nakayama, Shinichi 

This report shows the records of JAEA's investigation on dose rate reduction at the Fukushima University Junior High School and Kindergarten. The main outcomes are as follows. (1) ${it In-situ}$ experiments were performed to investigate intrusion depth of radiocesium in the soil. Based on the experiment, we proposed a countermeasure to reduce air dose rates. (2) The action we proposed allowed dose rate reduction to about one tenth to one twentieth at playgrounds. (3) Follow-up monitoring was performed after one year, and shows no obvious evidence of recontamination at the playgrounds. (4) Decontamination of a tree was tested. Radiocesium was accumulated around the root. By removing the soil, the air dose rate at about one-meter distance from the tree was decreased.

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