This design above is used to detect ions in the chamber. The FET measures very small currents due to the discharge of ions inside the can. These ions can enter the can from outside if it is open to the air, or they can come from the inside if there is an ionizing radiation that causes the gasses to ionize inside.
The Mineoro Ion chamber is said to be different in that it is claimed to "classify the ions" so they can be determined to be ions from gold. According to the scientific theories of the inventors, their ionic chambers are designed to detect just gold, and nothing else. They also manufacture other ionic chambers to detect other materials. The inventors of the Mineoro ion chamber once explained how it works to identify the presence of gold:
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Originally Posted by LRL inventors from the Mineoro website
When the negative "ion" finds its twin of opposite polarity, they love each other so intensively, that when they get together they provoke a short-circuit autodestroying themselves.
As in the Romeo and Juliet movie, both of them die, but the proof of their death is a flask of poison near them: in the same way, our "passionate ions" also leave a proof of their death in "emiting a crash", which generates an electrical signal so fast as nano, pico, femto or atto seconds, detectable in sensitive electronic circuits and projected for this aim.
The classifier just filters the negative "ions", twin pairs of positivie "ions" produced by the classifier.
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We can see this is advanced science, beyond simply putting a charge on an electrode inside tin can to sense ions discharging. In fact, the Mineoro gold classifier required a 25ct gold foil terminal and gold shielding to be used in order to measure the crashing "Romeo and Juliet" effect. And who knows what electronics are processing these femto and atto second "crashes" to determine they were induced by the presence of "passionate ions" from distant buried gold?
Of course, at this stage I see people simply trying to measure ions with sensitive FET amplifiers. And I wonder how a treasure hunter with these FET ion sensors will know the difference between ions in the air near a copper coin, a tin can, or a gold ingot. How will they know the ions they are sensing are not caused by gamma radiation from a nearby source, or by a tree that has a static charge? Or maybe a damp spot on the ground has reduced the static charge in the air at a certain location?
Wouldn't all the tiny pulses of current through the FET look the same to the amplifier? Wouldn't they all look like the same collections of tiny pulses of current that come each time an air molecule discharges against the electrode, regardless of what caused the discharges?
Best wishes,
J_P