What determines PI sensitivity to gold?

[Anonymous]

Is it strictly a matter of pulse delay rate?
Will a 15usec. machine always be more sensitive to gold than a 22usec. PI? Does anyone know
the pulse delay rates of the Whites PI,
Garrett Seahunter MK II, Tesoro Sandshark, or
Headhunter PI?

 

[Anonymous]

In a nut shell, it

 

[Anonymous]

Hi Ed,
You really have to qualify your question as to what form the gold takes. Gold nuggets, gold rings, gold bars? You then have to state a range of sizes and purity over which you want the detector to be efficient. For example a detector designed to be sensitive to small nuggets, thin gold chains, thin 9k rings, will not be so good on gold coins, gold bars or

 

[Anonymous]

Does wading usually allow the shortest delay of 10 or 15uS ? Or are this times dedicated for nugget hunting and dry sand hunting only ?
In other words, as conductivity of the environment do we intend the environment of the coil or the whole zone surrounding the detector?
Thanks

 

[Anonymous]

Hi Seric,
You can certainly use 15uS when wading and sometimes 10uS, depending on the depth and salinity. In fairly still water up to a couple of feet deep 10uS can be used. Beyond that, the conductivity of the water gives too big a signal and the delay has to be retarded. Sooner, if there are waves.
The magnetic field of the coil extends outwards for many feet, and excites a very large volume of water. That is why something that is a relatively very poor conductor can give a strong signal.
Eric.