FlyerTalk Forums - View Single Post - Backscatter Xrays and my first experience.
Old Jan 4, 2011 | 9:15 am
  #18  
cardiomd
 
Join Date: Nov 2010
Location: Up in the air far too often.
Programs: Star Gold
Posts: 354
Originally Posted by kbug43
I'm an engineer, not in the medical field, but I have to have annual radiation safety training simply to work in a materials characterization lab where there is a SEM and a real time x-ray inspection system. There is additional training to actually use the equipment. Our RSO (radiation safety officer) does monthly audits with the Geiger counter and the state comes in to inspect annually. We have an array of radiation monitors in the lab and those monitors are calibrated annually. The x-ray has interlocks and the SEM basically can't operate in an unsafe condition (it would burn out the filament). I worked in that lab while pregnant and neither I or my obstetrician had any concerns over radiation safety.

Do the TSOs at my local airport with the backscatter machines (which are virtually never used) have annual radiation safety training? Are they even capable of explaining the difference between ionizing and non-ionizing radiation? Do they have a radiation safety officer monitoring the equipment for their safety and that of the traveling public? How are these backscatter machines calibrated, how often, and by what lab?

I suspect I know the answers to these questions, and I don't like those answers. Privacy concerns aside, I will not use a device that emits ionizing radiation if it's not operated by a physician or a licensed radiology tech.
Agreed, I am appalled that the TSA seem to be "getting a pass" on this. In my field we wear dosimeters for fluoroscopic machines that are "not always on" and just take pictures like the WBI. Granted, it is transmission imaging not backscatter, but our machines are highly characterized. The TSA defers to a few third party dose emission studies on non-production units for dose output.

It is complex, but when dealing with a very remote threat, the risk to the populace has to be minimal. Giving all passengers a few mrem of radiation yearly is not necessarily low compared to the extremely, extremely low that they prevent any threat. Deterrence effects are notoriously hard to measure, but low given the historically low threat rate before WBI was even technologically feasible.
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