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Gold/Mining/Energy : A New Age In Gold Refining -- Ignore unavailable to you. Want to Upgrade?

To: Michael J. Wendell who wrote (483)	1/21/1998 12:22:00 AM
From: Bill Jackson	Read Replies (2) \| Respond to of 672

Michael; You can now buy a field XRF device for about $50,000. You place the sample in a standard container, and cycle it into a shielded internal source for a standard interval. It is good to around 2-5 grams per ton, depending on the cycle time. Dome was testing one for a while. However it was too insensitive as they want to track lower grades than that. The value is very good if you keep it busy as you can place a number of samples in the pot at the same time to get them irradiated and then read them. You need an AEC licence and trained tech. I think they use a bit of long gamma emission stuff for the x-rays. I saw it at a trade show, and they told me Dome tried it. NA would also be possible, however you would need sample storage, and the residence time might be excessive as they cannot really make a fully portable hell to give a high flux, so they would needst make it low intensity? So NA will probably remain part of a large reactor coterie for the time being. Bill