How long does it take for radiation to dissipate?

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Tags

1. #nuclear
2. #occurring
3. #reactor
4. #radioactive
5. #after
6. #times
7. #naturally
8. #about
9. #20000
10. #years
11. #explosions
12. #uranium
13. #depending
14. #radioactivity
15. #waste
16. #hours