Development of radioactive decontamination system of agricultural land by grazing of cattle

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Cs concentration(Bq/kg) of blood in the Japanese Black (B) and the Japanese Shorthorn (N) grazing cattle of Tohoku University was 143.14 and 121.86, respectively. Effects of age and breed were significant, with N than B, and yearling cattle than 2 years of age or older, were significantly higher. Cs concentration of blood in cattle having been fed with clean feed in the emergency evacuation zone surrounding the nuclear power plant was 18.1. After fed contaminated feed, it became to 68.8. In the liver, deposition of tellurium and silver were found. Air dose rate of grazing land, was attenuated up to 80% which was 5% more than natural attenuation. Locally, Cs decreased to 38% of the original on the slopes near the top and increased to 27% of the original at the bottom.