Now it can be told: rice contamination is not related to soil radiation; at least that’s what a government survey showed.
The survey jointly conducted by the Fukushima Prefectural Government and the Ministry of Agriculture, Forestry and Fisheries revealed that there is no direct correlation between high doses of radiation in rice and the soil radiation levels. Instead, high radiation may be attributed to a lack of potassium and insufficient cultivation of rice paddies, the survey suggested.
Soil samples where rice grown was found to have high doses of radiation had been inspected. Results showed that the levels of potassium in those samples were significantly lower than the average concentration of potassium in the prefecture.
Also, rice grown in poorly cultivated rice paddies revealed above the limit radioactive cesium.
Furthermore, rice with close to 800 becquerels of cesium- more than the government set limit of 500 becquerels per kilogram, was found in a paddy that had radiation levels of only 2,321 becquerels -- less than half of the limit allowed by the farm ministry. Paddies with soil radiation doses below 5,000 becquerels were allowed to be planted with rice.
With these recent findings, the Fukushima Prefectural Government came to a conclusion that there is no direct link between levels of radiation in soil and contamination in rice grown in that soil.