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I feel that some manufacturers would take into consideration type of materials used in making the camera, while others might not. That's why IMO cameras from different manufacturers and with different sensors will show a varied response to fast particles. I think this paragraph explains it fairly clearly:
"One of the primary causes behind this phe- nomenon is natural radiation from Alpha particle sources. The major sources of Alpha particle emission have been found in the semiconductor material itself, as well as the materials used in packaging the die, and natural radia- tion from the ground (i.e. Radon.)"
And yes, CCDs do get gradually affected by such particles in a permanent way.
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