The effects of radiation in Food chain of Hiroshima and Nagasaki is yet to be got rid of.
We are not sure how the soil in Japan might have been affected.
Follow the stories below.
How does one remove Radiation in the soil?
It is important Japan is sent aid in the form of Food for the time being rather than money till such time a way is found to irradiate the soil.
Japan-Radiation in Soil very High.
Concerns about radiation in Japan have now spread to the soil surrounding the crippled Fukushima Daiichi nuclear reactor. One level that was reported this week was high enough to suggest people in that area should be evacuated, an expert says. But he cautions that it’s hard to draw conclusions about these spot measurements without more data.
Today, Japanese officials told the population living up to 30 kilometers from the plant that they should consider leaving the area, expanding the previous 20-kilometer radius evacuation zone. But according to news reports, the advice stems from difficulties in supplying the region with food and water, not radiation levels.
Meanwhile, on Wednesday the Japanese science ministry began to report measurements of cesium-137 in upland soil around the plant. The levels are highest from two points northeast of the plant, ranging from 8690 becquerels/kilogram to a high of 163,000 Bq/kg measured on 20 March from a point in Iitate about 40 kilometers northwest of the Fukushima plant.
The soil measurements are more significant for evacuation purposes than radioactivity in the air, says nuclear engineer Shih-Yew Chen of Argonne National Laboratory in Illinois, because cesium dust stays underfoot while air is transient. Levels of cesium-137 are also more important than soil readings of iodine-131, which is short-lived and more of a concern in milk and vegetables. “It’s the cesium that would prompt an evacuation,” says Chen.
Based on a rough estimate, a person standing on soil with 163,000 Bq/kg of cesium-137 would receive about 150 millisieverts per year of radiation, says Chen. This is well above the U.S. Environmental Protection Agency standard of 50 millisieverts per year for an evacuation. (Per day, it’s 0.41 millisieverts, which is equivalent to four chest x-rays.) But Chen adds, “one point [of data] doesn’t mean that much.”
The hot spot is similar to levels found in some areas affected by the 1986 Chernobyl nuclear reactor accident in the former Soviet Union. Assuming the radiation is no more than 2 centimeters deep, Chen calculates that 163,000 Bq/kg is roughly equivalent to 8 million Bq/m2. The highest cesium-137 levels in some villages near Chernobyl were 5 million Bq/m2.
Japanese food products have long been regarded as synonymous with “safety” and “security” in other parts of Asia, but their reputation is now at stake as radioactive materials far exceeding legal limits have been found in farm produce.
The detection of radioactive materials prompted the U.S. Food and Drug Administration on Tuesday to announce a ban on imports of dairy products and vegetables from the area near the crisis-hit Fukushima No. 1 nuclear power plant.
Countries in Asia and authorities in the Russian Far East have stepped up screening of Japanese food imports for radioactive contamination, while seawater has also been contaminated near the nuclear plant.
“Japan had been promoting its food overseas by emphasizing its safety and security,” a Japanese man in Beijing who engages in trade with China said. “Actual safety may be secured by inspection, but it is difficult to restore a sense of security.”
The nuclear crisis triggered by the massive quake and tsunami occurred just after the government moved to market Japanese agricultural products such as rice, which has a reputation for being “safe and tasty,” in the Chinese market, where the popularity of Japanese foods was growing mainly among wealthy people.
In China, the General Administration of Quality Supervision, Inspection and Quarantine ordered local authorities Monday to inspect Japanese food imports for radiation, the Xinhua news agency said, posing a big challenge to Japan’s aim of expanding food exports there.
South Korea’s Food and Drug Administration has started similar measures, stepping up screening of foreign farm products shipped through Japan by adding dry, frozen and processed foods produced in Japan as subject to inspection.