Sorry, no online dictionaries contain the exact phrase opaque to radiation.
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Reverse dictionary results:
1. radiopaque
 2. radioscopy
3. opacity
4. window
5. fluoroscope
6. radiology
7. diaphragm
8. efficiency
9. load
10. radiography
 11. x-ray
12. clear
13. dense
14. hazy
15. obscure
16. opaqueness
17. pellucid
18. shade
19. shades
20. shadiness
 21. shadow
22. silhouette
23. alabaster
24. aventurine
25. body
26. cloud
27. cloudy
28. diorama
29. film
30. filming
 31. haze
32. hazing
33. lacquer
34. mask
35. masking
36. milk
37. open
38. penumbra
39. screen
40. scrim

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You can look up the words in the phrase individually using these links:   opaque ?   to ?   radiation ?
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