[08-15]

The problem with that study is that "people who take a CT scan" is not exactly an unbiased sample of the general population.

Now compare this to

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2477708/

> only a single one in your life

"A single dose" as in "a discrete event". Another single dose the next month is (probably) harmless again. Cells react to radiation with repair mechanisms, and once that activity subsides, the event is over.

Radiation exposure isn't linearly cumulative. The argument that it is was made before we even knew the structure of DNA! Today, we know better.

[ItsMe000001]

I also recommend at least the "Conclusion" section of this document, selected as an example, not as the one definite document: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3611719/ It is a good read overall too. You make it sound as if it does not matter. Apparently that is not the general medical opinion.

I also don't see what the problem with the selection of people is supposed to be. Those selected are more likely to not be able to repair DNA damage? I think this particular selection makes no difference for the purpose.

Overall, OP said "there is no evidence" and it seems that yes, there is. What you think of that evidence is not the question, OP had said there isn't any. When I look at the actual recommendations it seems that most medical people don't think so, after all, the recommendation still is to limit the radiation exposure, not just for the frequently exposed (radiation workers) but also for those one-time patients.

Even on a per-event basis reducing the amounts of radiation was and is a major design goal for the devices. Does not look like those who are involved in all of this think there is no problem.

[08-15]

> Overall, OP said "there is no evidence" and it seems that yes, there is.

This is evidence for a correlation between the number of CT scans and cancer incidence. To jump to the conclusion that the cancer is caused by the radiation from the CT requires a leap of faith.

The funny thing is, if an epidemiological study shows that low dose ionizing radiation is beneficial (radioactive apartment buildings, nuclear navy workers), it's dismissed by a completely ad-hoc "healthy worker effect" or "healthy student effect". But in a study of people who received a CT scan, where you should expect a "sick people effect" (healthy people don't get CT scans), you "don't see a problem".