Looks like the TSA and the government (one and the same) have been lying. The machines that they are using, aren’t as harmless as they’ve been saying.
Check my junk please. No touching of the junk though.
From Ace of Spades…
Jason Bell, a biochemist working in biophysics.
Chromosome Damage From Radiation
On the significance of the type of radiation used:
The TSA has been stating that the X-rays used in the back scatter machines use ‘soft’ X-rays, which are defined as radiation between 0.12-12 keV (or kilo electron volts) and are generally stopped, or absorbed, by soft tissue or low density matter. ‘Hard’ X-rays are between 12-128 keV and are absorbed by dense matter like bone. According to the TSA safety documents, AIT uses an 50 keV source that emits a broad spectra (see adjacent graph from here). Essentially, this means that the X-ray source used in the Rapiscan system is the same as those used for mammograms and some dental X-rays, and uses BOTH ‘soft’ and ‘hard’ X-rays. Its very disturbing that the TSA has been misleading on this point. Here is the real catch: the softer the X-ray, the more its absorbed by the body, and the higher the biologically relevant dose! This means, that this radiation is potentially worse than an a higher energy medical chest X-ray.