Passenger Screening
GE’s SRT Kiosk
both outside the body and in body
cavities. Naturally, the radiation
“…backscatter X-ray
Longer-term Options
Terahertz (THZ), which lie between
concerns are higher, both in terms of X-
systems may be too
millimetre wave (>1000GHz) and
ray energy and dose (at least 10 infrared on the electromagnetic
times), than for backscatter, making spectrum. THZ has both radio and
this technique currently unacceptable slow for primary optical qualities, giving it two possible
for Western regulators, even if privacy advantages: better image quality due
concerns are avoided. That said,
screening, although
to the smaller wavelength and the
transmission X-ray may find potential for discriminating different
applications by prison services and
the image quality
materials via their THZ spectra. If
customs agencies where greater successful, this would allow automatic
licence for more extensive search is
makes it ideal for a
material identification rather than
often afforded by the regulators. merely providing an operator with an
Whole body transmission X-ray
systems, such as OD Security’s Soter
rôle in resolving
image. However, cost effective THZ
emitters (typically specialty lasers) are
and Adani’s DRS SecureScan are still expensive and much remains
physically wide to minimise image
threats. However, this
unknown about material properties at
distortion, which poses installation these energies. Picometrix (US) and
challenges in the tight spaces available same image quality TeraView (UK) are both working on
at most checkpoints. Adani sells a terahertz systems.
more compact transmission X-ray
gives the technique an
QR whole body scanning. Quadrupole
system for scanning casts and Resonance, an RF technique that uses
prosthetic limbs. Such an application
undeserved reputation
energies in the AM radio band can be
would result in a lower full body X-ray used to screen passengers if the dose
exposure than a whole body
transmission X-ray scan.
of being an electronic
rate is sufficiently low. Challenges
remain, not least due to radio
Possibly the last uninvestigated part of
the electromagnetic spectrum is
strip search…”
frequency interference, to create a
compact, safe and cost-effective
10
www.asi-mag.com February 2007 Aviationsecurityinternational
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