枝野幸男说，有“微量”的放射性物质随着蒸汽被排放至大气中。
“Tiny amounts” of radioactive material had escaped into the air during the ventilations, Mr Edano said.
它的作用不是用来遮挡放射性排放而是阻止放射性烟尘和其它物质的释放，以及遮挡雨水以防止雨水携带污染物流入地下水。
Its purpose is not to shield radioactive emissions but to prevent the release of radioactive dust and other materials, and to keep out rainwater, which could carry contaminants into the water table.
原子能设施中排出的气体中，含有放射性的氪、氙、碘等物质，必须用活性炭将它们吸附干净以后再行排放。
Nuclear facilities in the exhaust gas, radioactive krypton, xenon, iodine and other substances, must use activated carbon adsorption to clean them again after discharge.
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