With projections through March 2032, the forecasts are based on data gathered last March.
They are designed to help municipalities draw up recovery plans and create programs for displaced residents to return home.
But the projections do not take into account experimental decontamination efforts currently being explored.
The report, presented by trade minister Yukio Edano says some areas surrounding the crippled nuclear reactors will still be contaminated with radiation levels above 50 millisieverts a year in March 2022.
That means the areas will remain off-limits to evacuees even beyond that time.
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