It depends: The health physics society site is an excellent resource on radiation dose and effect: http://hps.Org/. The dose is dependent on several variables, most importantly the patient's size. It takes more radiation to make and x ray of an obese person than a thin person. The average dose for an ap full spine is likely in the 2.5-3.0 msv range. This is about equal to 1 year of ambient radiation.
Answered 9/28/2016
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