Hogwash.

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

"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.