To put this into perspective, the granite in Grand Central Station makes it several times above background.
I have not seen any reputable evidence of "high radiation levels." Dust content was 2X above background = nothing interesting.
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And smoking a cigarette gives you thousands of times above background exposure.
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Lots of building materials (granite, ceramics, etc.) contain detectable amounts of uranium and thorium. So many possible sources in debris.
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There were also several medical offices in WTC complex, too, and they sometimes have devices with significant activity. You get my drift.
End of conversation
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