> There are two fundamental techniques for imaging ; measure the
> reflected part / measure the absorbed part (reflection/transmission).

Terahertz imaging uses the third one - measure the radiated part. A human b=
ody radiates quite a lot of energy in the terahertz region, and it is this =
energy that proposed full body scanners at airports etc are using to detect=
 people carrying weapons.

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Scanned by iCritical.

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