Decontamination of radioactive-iodine- and cesium-contaminated spinach using sodium dithionite

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  Washing of the spinach with water by the Nishizawa method resulted in the removal of about 13 ± 2% of the 131I and 45 ± 20% of the 134Cs and 137Cs. Removal rates of 131I of approximately 76 ± 3% after further washing with 1.2 wt% Na2S2O4 for 2 days and 47 ± 2% washing with 10 wt% Na2S2O4 for 2 days were obtained. These values agreed with the dissolution rates of 131I in the liquid used for washing within 2 to 3% error. The removal rates of 134Cs and 137Cs after washing with 1.2 wt% Na2S2O4 for 2 days were 69 ± 47% and 100 ± 52%, respectively, which were in poor agreement with the corresponding dissolution rates. The removal rate of 131I after brief washing with 10 wt% Na2S2O4 was negligible and the dissolution rate was 5 ± 2%. The removal rates of 134Cs and 137Cs for 10 wt% Na2S2O4 increased from 26 ± 11% to 42 ± 11% and from 30±20% to 42 ± 20% after washing with Na2S2O4 for 2 days. The high removal rates in 1.2 wt% Na2S2O4 may be due to the effective reduction of the I2 on the surface of the leaves by Na2S2O4 (1.2 wt%) during the 2 day immersion, which occurred without the bleaching of the leaves and stalks, which occurred in the case of 10 wt% Na2S2O4.<br>

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