This was covered in that NPR article I linked to. The concern being that the .02 microsievert was an average over body area, not total exposure. Even when taken total body exposure into account, which is being generous, the additional radiation exposure is still negligible. Of greater concern is the nature of it's implementation; namely of it's scale and widespread adoption without sufficient time for the proper studies to be done, and potentially too quickly for proper training and qualification to be administering the radiation. The average development cycle of a new drug or treatment to go from Pre-Clinical to clearing Phase III is about 14 years. So even going into this knowing it's safe from a health perspective... it's cutting a hell of a lot of corners which should not be cut.. because *IF* an unforeseen factor or set of circumstances are discovered which do pose a health threat, you need to know that while the technology is still being used in small and controlled samples.
It's not absorbed by the skin. That's how it works, by passing through clothing and reflecting, backscattering, off of the skin. Were the radiation absorbed, then there would be nothing for the sensors to pick up and construct the image from. IIRC, the X-Rays don't even penetrate the stratum corneum - the top layer of the epidermis which is composed of dead skin cells.
Again, I'd say passengers are pretty much fine, even the frequent fliers. If I were worried about any risk group - it would be the flight crew, and even then it'd be a matter of tipping points considering how much radiation they're already being exposed to by spending extended periods of time at high altitudes.
I would consider that, as mentioned above, to be a bigger concern... though again, still rather negligible considering how low a dosage of radiation is being delivered. Even having it miscalibrated to give off .1 microsievert (which may not even be possible depending on how the machine operates and procedure concerning with tolerances) wouldn't be significant.
I understand completely, and you should doubt me. I am by no means an expert or even well versed on radiation. What I would do in your situation is to talk to those who are well versed in dealing with radiation. That may entail writing a few emails to some Physics professors asking their opinion, talking to your local hospitals radiologist, and reading up on studies done in the peer-review literature. PubMed is an excellent archive, but beyond the abstract it's not free. Sometimes there's a link-out to an open access version, or you could try to see what's available on
PLoS (Public Library of Science, which gives the full paper for free). Hell, even Wikipedia can be a good option provided you follow up on the sources and find whether or not they're credible.
But if it's a matter of trusting some guy on the internet, consumer reports, or "the gub'mint"... then that's all you're going to have to go on, is trust... because none of those are held to the rigid standards that peer-review and practicing experts are held to.
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