"Alexander Grigoriev" wrote in message
link.net...
Hogwash.

Yep, that is all you have.
Another such technology is called Quadrapole Resonance or QR. Originally
developed by the Department of Defense to detect land mines, QR directs a
beam of radio waves at an object. The radio waves will penetrate the object
and infuse whatever is inside. When the radio waves pass through an
explosive material, the molecules of that material will polarize or develop
a small electrical charge. As the molecules lose their charge, they emit a
very weak radio frequency signal that can be picked up and analyzed to
detect explosives.
Because it relies on harmless radio waves that are easy to produce and
monitor, this technology is considered to be one of the most promising in
the field.


MRI detects primirily concentration of hydrogen atoms. It requires quite
strong magnetic field with precise gradient. What you describe is using
different principles.

And another one that needs to keep up on technology
Here are some links that will explain what I am talking about.


http://gazette.gmu.edu/articles/4925/
Sauer's studies are focused on nuclear quadrupole resonance (NQR), a type of
radio frequency spectroscopy that can help identify many substances without
the use of a large static magnetic field

http://www.americanscientist.org/tem.../assetid/39131

The phenomenon of nuclear quadrupole resonance is akin to nuclear magnetic
resonance, which is the basis of magnetic-resonance imaging. But unlike MRI
scanners, instruments based on nuclear quadrupole resonance are not required
to generate strong magnetic fields.



"Dana" wrote in message
...


Hogwash.
You seem not to understand what can be done with electronics.
There are some devices that use the priciples of a MRI and shrink it
down
to
a hand held sized device to scan for explosives. Since the compounds in
explosives give off a unique signature after being exposed to a strong
magnetic field, that signature is then stored in memory. Now your sensor
emits a magnetic field, and the reciever looks for the signature of the
explosives.
So it is only a matter of expanding your signature library, and your
receiver can be programmed to look for pretty much anything.
This is only one of many new tools that are out.
The semiconductor junction detector has been out for around 30 years.