Changes in the radioactivity of
131I,
134Cs and
137Cs in milk which was produced by the cow supplied the pasture (Italian ryegrass) were examined from 30
th May(about 2.5 months after the accident in Fukushima Daiichi Nuclear Power Plant) to 26
th June, 2011. In Animal Resource Science Center located at Ibaraki-prefecture (about 130km south-west of far from the power plant), the cows were kept and the pasture was cultured. No
131I was detected neither the milk nor the pasture. It was found that the radioactive nuclides (
134Cs and
137Cs) included in the pasture, which was given to the cow for 2 weeks, were transferred to the milk. After exchange the feed from the pasture to imported feed, which was given for 2 weeks, radioactivity in the milk rapidly decreased. The radioactivity of these nuclides in the cow milk were lower than the provisional and new confirmed government regulated values(200 and 50Bq/kg for radioactive Cs, respectively).
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