Radioactive caesium has also been detected.

还发现了放射性铯。

youdao

The main radionuclides representing health risk are radioactive caesium and radioactive iodine.

意味着健康威胁的主要的放射性核素包括放射性铯和放射性碘。

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Radioactive caesium-137 also appeared in one of the samples, but at levels below the legal limit.

其中一个样品中还检测到了放射性的铯-137，但是还在法律限定标准之下。

youdao

But the Korea Institute of Nuclear Safety said that although small levels of radioactive iodine and caesium particles had been found in rain falling in part of the country, they were not enough to cause concern over public health.

BBC: Japan quake: Nitrogen pumped into nuclear reactor