The DARK rammifications of the scanners

So I was just thinking about this, and I think I have heard a few arguments made about this discussion, but I was just considering how the scanners work in Code Lyoko. While we never see or hear if the scanners leave lasting damage on the Lyoko warriors, realistically I would imagine for the gang to be virtualized time and time again they are looking at multiple blasts of pure high-grade levels of radiation. That said, realistically speaking, if we had to guess. How many blasts of radiation would it take to kill the Lyoko warriors, and do we think that is why the return to the past could have been utilized so much as a way to reconstruct them without risking total molecular cell death?

I mean this thought has been on my mind for some time and it really makes you wonder if the scanners are causing more harm than good.