I've read that the radiation exposure from one CT scan is equivalent to over 200 chest x-rays. I'm not sure how accurate that is.
Edit: From Wikipedia
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Thus, cardiac CTA is equivalent to approximately 100-600 chest X-rays or over 3 years worth of natural background radiation.
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One study indicated that radiation by CT scans is often higher and more variable than cited and each of the 19,500 CT scans that are daily performed in the US is equivalent to 30 to 442 chest x-rays in radiation.
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