August 22, 2012

Why is the inner exposure of radioactive contamination in Fukushima low?

Date: Wed, 22 Aug 2012 11:39:12 +0900 I think he can talk in seafoods issues if we explicitly request to him. When I visited Minsk', an expert of Belarussia Ministry of Emergency Situations said, "Limit of 1mSv/yr from inner exposure is not feasible". I said, "According to the duplicate diet study, the actual inner exposure in Fukushima is 0.01-0.1mSv/yr (Asahi Newspaper 19 Jan 2012)". After this visit to Chernobyl, I realized the difference between Belarus and Fukushima. The former is characterized by local production and consumption in agriculture, but the latter people eat foods from outside, even cows feed on imported grass/corn (In belarus, inner exposure from milk is serous). A very few residents in Fukushima are highly contaminated because of not eating local foods. Their contamination level is ca.1.2mSv/yr, but its risk is much less than indirect smoking (equivalent to >100mSv/yr). We should inform the magnitude of risk for local consumers, but I do not like to discourage local consumption even in Fukushima (I do not like globalization in ecosystem services). Japan does not prohibit smoking. Many coastal fishes/seafoods and inland fishes are still contaminated (>100Bq/kg). These fish never go to the market. In lakes, eating these fish caught by game fihsing is prohibited. In comparison with Chornobyl', such strict regulation is unnecessary. Japanese government did not adopt the regulation in case of emergency. Now our regulation policy is based on managed scheme (as rigorous as the disaster does not happen). It does not match the ICRP policy.


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