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When inspectors found suspicious nuclear material at this site, the Iranians said it was just contamination.
BBC
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Some of this material will be used to scrub the machinery's innards of any contamination that may have travelled with the rover from Earth.
BBC: Curiosity Mars rover takes historic drill sample
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Relatively low contamination levels in western Japan could be explained by mountain ranges sheltering those regions from the dispersal of radioactive material, the authors said.
BBC: Fukushima fallout fears over Japan farms