Japan’s Govt Estimates Efficacy of Decontamination

Tokyo, June 23 (QNA) – A Japanese government report suggests decontamination work could significantly lower radiation levels by 2021 in no-entry areas after the Fukushima Daiichi nuclear plant disaster.

Japan’s Cabinet Office has made its first estimates of the efficacy of decontamination in no-entry and evacuation zones near the crippled plant. Radiation exposure in these areas exceeds 50 millisieverts per year, according to Japan’s (NHK WORLD) website.

Full-scale cleanup operations have yet to begin in these areas.

The report proposes as a hypothetical model a person who spends 8 hours per day outdoors and lives in a house built of wood.

In places with an annual radiation reading of 100 millisieverts, it says decontamination would reduce levels to a range of 9 to 20 millisieverts by 2021, one decade after the nuclear accident.

Areas with 50 millisieverts would see a decline to between 6 and 11 millisieverts.

In both cases, decontamination would help cut levels to below the maximum allowable annual threshold of 20 millisieverts, which is one of the government’s conditions to lift evacuation orders.

When the figures are multiplied by factors to better simulate actual conditions, the annual radiation exposure of adult male individuals would stand between one and 12 millisieverts.

The Cabinet Office says it will refer to the estimates in considering a cleanup of contaminated areas. (QNA)

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