The agriculture ministry now says removing that contaminated topsoil may be effective .
农业省现在表示去除受污的表土可能有效。
When city council finally decided to build housing on the section , gardeners and their friends moved an acre of topsoil to the remaining portion of the garden .
Koriyama officials contacted nuclear experts and were told that removing a layer of topsoil from school grounds could reduce radiation levels , because cesium tends to collect in the top layers .
If just four centimeters of topsoil is scraped off the contaminated farmland , the ministry says , it would create 3.3 million tons of waste .
农业省说,即便只给受污染的农田刮去4厘米厚的表土,就会产生330万吨的废土。
A new cleanup law doesn 't take effect until january . Cities across fukushima prefecture are scraping contaminated topsoil off school grounds and parks , but tokyo hasn 't yet decided where to store the tainted material .