alt Hacker NewsI read once that a CT scan is roughly equivalent to 1000 hours of flight WRT radiation exposure. I've had about 6 or 8 of those over the years.
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magnetic • today at 5:18 PM
This chart has the flight & CT scan scenarios (among many other): https://xkcd.com/radiation/
Depends on the actual scan. A head CT can be as little as one sievert while a full blown angiogramm can be more than ten sievert. A pilot can accrue 40k flight hours over his career. If 90% of that is at cruising altitude (meaning 3-6 microsievert/hour), that would be 100-200 mSv in total. That would be equivalent to more than a hundred head CTs or a dozen angios. If you need that many CTs, your lifetime cancer risk is probably your smallest concern. But you still wouldn't expose any normal human to that level of radiation.