What is used inside a badge to detect radiation?

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Tags

1. #gamma
2. #ionising
3. #badge
4. #allowing
5. #photographic
6. #effect
7. #called
8. #people
9. #other
10. #radiation
11. #placed
12. #badges
13. #holder
14. #different
15. #radiations
16. #detection
17. #windows
18. #detectors
19. #metals
20. #inside
21. #including