Thanks for the excellent explanation Carl. That pretty much tells the whole story about what is the gold NMR resonant frequency.
Your explanation also sheds some light on frequencies of other materials. I suppose if we wanted to learn the true resonant frequencies of materials like copper, lead, diamond, paper currency, semiprecious stones, etc, we would the scientists already know these frequencies and have published them in charts, which are likely to be something different than is advertised by LRL manufacturers, or frequencies generated in their circuitry.
For example, if we looked up the resonant frequency for diamond, I presume we would be looking for data on carbon NMR frequency in a 50 NT field. The question is: How would we determine if the carbon we found at this frequency is a diamond or a piece of charcoal, or part of a tree branch? Maybe we located some CO2 in exhaled air. If it were possible to sense the NMR frequency of carbon using a hand held locator in an open field, wouldn't a diamond be lost in an overwhelming amount of stray carbon found on much of the surface of the earth and in the air?
Also, it seems like it would be hard to detect anything without some high powered lab equipment. Hospital MRI machines are so powerful that they refuse to allow an MRI test on anyone who has ferrous metal fragments embedded in their body, for fear of causing injury in case the fragment was ripped loose by the intense magnetic field. Yet this field strength is necessary to make it possible to generate any kind of recognizable medical image.
This makes me wonder how a hand held device with battery power can locate the NMR of anything at distance, especially when the hand held locator is tuned to the wrong frequency.
Best wishes,
J_P
|