What is alpha radiation stopped by?

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Tags

1. #halted
2. #eventually
3. #consisting
4. #stopped
5. #nucleus
6. #consists
7. #dense
8. #absorbing
9. #electrons
10. #paper
11. #radiation
12. #alpha
13. #gamma
14. #density
15. #readily
16. #aluminium
17. #sheet
18. #plate
19. #absorbed
20. #helium
21. #material
22. #penetrates