Radioactive elements that last the longest are the least radioactive.

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Short-lived radioactive elements in spent fuel tend to be highly radioactive but for a short time.  Radioactive Iodine 131is very radioactive but decays rapidly in around 30 days.

On the other hand, Plutonium 239 has a half-life of 24000 years and is minimally radioactive giving off its radioactivity very slowly over that long period of time.

Phil Carlson