No it's not.
Just a point of note: You do receive far more radiation during your flight than you get from the scanners due to the higher altitude, even on a short flight. These scanners only subject passengers to about .02 microsieverts (the international dosage measurement of ionizing radiation), whereas the average exposure to radiation on a transcontinental flight is...
roughly 20 microsieverts. (Exposure could be more or less depending on altitude, average long & lat positions along the flight path, solar activity, etc) A paper published in the American Journal of Industrial Medicine gave a preliminary finding of about 0.3 to 5.7 microsieverts per hour mean over 37 flights.
PubMed Source
To put this in perspective, we receive roughly 2,000 to 3,000 microsieverts from normal background radiation sources in the environment annually. A little over 5 1/2 to 8 microsieverts every day. 70 ~ 100 microsieverts from a chest Xray. (figures gathered from
NPR and The Lancet, vol 343; No. 8889)
The TSA scanners are not a health concern in and of themselves. For the average passenger, the additional radiation exposure from the scanners to what they receive in-flight is negligible - pregnant or not, regardless of the term. In fact, the radiation safety division of
Duke University states (of) "Fetal Dose Less Than 1,000 millirem -- There is no evidence supporting the increased incidence of any deleterious developmental effects on the fetus at diagnostic doses within this range." (That's 10,000 microsieverts after conversion)
My only concern, in regards to radiation exposure, would be for the flight crew who spend extended periods of time at high altitudes and are either subject (or set to be subject) to these scanners in addition. While the radiation levels are negligible for your common passenger, extended exposure to elevated radiation levels and repeated scanning poses a much muddier subject when establishing a safety threshold for exposure.
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