Microchips in lieu of labels

penstemon penstemon@Q.com
Tue, 17 Mar 2015 12:18:38 PDT
I know dry sand is transparent to microwave but wouldn't damp earth shield
against radio frequencies?

In the utility industries, with what are known as “out-of-sight” terminations, a device is buried which can be located with a detector. Wet soil or not. It’s spring, and so my mind can’t remember how this works exactly. Not quite the same as locating buried cables, which requires a signal to be applied to the cable. 
So it would be possible. (If not slightly ridiculous; I would have to buy thousands of devices.)
Bob Nold
Denver, Colorado, USA
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