Decontamination ratios of
103Ru
134Cs, and
137Cs were determined for leafy vegetable samples after they were cooked. Samples contaminated with radionuclides from the Soviet Chernobyl reactor accident were obtained in Akita City. The decontamination ratio of the
103Ru content of washed spinach samples to that of similar unwashed samples was 0.83 ± 0.21. The ratio of the
103Ru content of leafy vegetables and edible wild grass samples which were boiled in water to that of similar washed samples was, on the average, 0.72 ± 0.20. The overall decontamination ratio of
103Ru in boiled leafy vegetable samples to unwashed vegetable samples was 0.52 ± 0.20. The decontamination ratios of
134Cs and
137Cs after washing were 0.65 ± 0.42 and 0.64 ± 0.17, respectively. The reduction ratios of
134Cs and
137Cs by boiling were 0.50 0.15 and 0.53 ± 0.13. The overall decontamination ratios were 0.33 ± 0.24 for 134 Cs and 0.34 ± 0.12 for
137Cs. These results indicate that the decontamination ratio of 0.5 which is stipulated by the Nuclear Safety Commission, Japan, is a practical value.
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