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ksdkjlf t1_j25d9u5 wrote

You're off by an order of magnitude. Per the FDA:

"A CT examination with an effective dose of 10 millisieverts [an abdominal CT averages 8] [...] may be associated with an increase in the possibility of fatal cancer of approximately 1 chance in 2000. This increase in the possibility of a fatal cancer from radiation can be compared to the natural incidence of fatal cancer in the U.S. population, about 1 chance in 5 (equal to 400 chances in 2000). [...] If you combine the natural risk of a fatal cancer and the estimated risk from a 10 mSv CT scan, the total risk may increase from 400 chances in 2000 to 401 chances in 2000."

400 in 2000 to 401 in 2000 is a change of 20% to 20.05%.

One abdominal CT is not "lots of harmful radiation".

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