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The dangerous part, and the part that is discussed in the article, is CS-137, which has a half-life of about 30 years. The longer the half-life of something the less radioactive it is.

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>>> That speck of spent fuel is still radioactive enough after 30 years to push most nuclear industry workers over their annual permissable dosage. Chernobyl itself is still phenomenally radioactive - but is far less so than it was immediately after the accident.

I was refelcting on this, not the original article and not on CS-137.

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