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Geo, The ratio doesn’t mean too much to me as I can’t tell signal from noise without a spectra to look at. The count needs to be baseline corrected. Net area would be a better way to look at it

GeoThanks for the offer?I have almost all of them except TaI will give it a pass for nowAnyway nice collection of some uncommon metals?Taray

Cool find Charles. Thanks for showing. Geo To: [email protected] Sent: Friday, January 22, 2021 7:40:24 PM Subject: Re: [XRF] Obsidian It is transparent with the streaks you see. The dark area in the

It is transparent with the streaks you see. The dark area in the center is the putty holding it up. According to some collectors I have talked to online this is probably a desert side notch between

Thanks. #5 is on your screen shot, now I see it is sample #5 taken on that date. Geo To: [email protected] Sent: Friday, January 22, 2021 6:01:24 PM Subject: Re: [XRF] Obsidian 50 kV, 40 kV, and 15 kV my

This will surprise you I bet. Beam current stays constant, 1mm beam collimator. kVp adjusted in 5V steps for 30 sec runs Tungsten target in tube Sample = shield volcano lava from *Carrizozo Malpais

50 kV, 40 kV, and 15 kV my tube is a Au anode. It has different filters for each. What is #5 filter? I’m not familiar with that. Dud Sent: Friday, January 22, 2021 4:00 PM To: [email protected] Subject:

Dud, remind me again what are the 3 beam energies, and also what is the tube target? Is #5 the filter for all shots? Geo To: [email protected] Sent: Friday, January 22, 2021 1:51:19 PM Subject: Re: [XRF]

Obsidian point #2- what is the microscope camera used? Or was it? I'm disappointed in the 5MP one that came in the other day. Geo To: [email protected] Sent: Friday, January 22, 2021 1:51:19 PM Subject:

Charles/ Geo Attached is an assay and picture of my Obsidian Point #2 which is clear with dark streaks much like the one Charles ran. The Pb content of this point is only 32 ppm with Fe at 3989, Rb

Taray send me you letter post address. I have cut you a piece of Zn, and a few others.A total of 14 "stamps". Geo

Spent some time with this material today, no Zn or any other metal present by XRF (except maybe Al), Kaolin clay is Al Si and O, non of which are readable with any certainty with my outfit. PS if Zn-O

I agree it is Ba not Cs. I made a mistake (actually my brain slipped into gamma spec mode for a second, Ba comes from Cs but by decay not XRF- Duh!), and as you mention the report is accurate enough

Nice find Charles and thanks for the XRF report. Is this clear or is that the picture making it look transparent? Geo To: "XRF" <[email protected]> Sent: Friday, January 22, 2021 6:25:11 AM Subject: Re:

This is an obsidian arrowhead that I found on my last collecting trip to White Signal, NM. It shows Fe, Pb, Rb, and probably Y as well. Charles

Geo, I believe if you look in log space you’ll see your new low is Si at 1.74. No Mg there however.. Also the Cs is the Ba Ka1 Ka2 and maybe the start of the Ba Kb1 at 36.3. Not enough count time or

Geo, Try readjusting your gain so the max energy will be 63 keV or so. That will handle both Am and the 50 kV tube without having to set up things again. You’re losing a lot of resolution by running

Trinity Ant Hill Sand I've been separating grains by color, then analyzing their Eu-152 content, then on to XRF for elemental content. These samples came from several contributors, having been

Not Trinitite per se but came from the same ant-hill. Conspicuously lightweight for its size, only 0.1g. Showing K, a new low energy for the Si-PIN experimental XRF arrangement with 1mm beam and W

.mca from this test attached. Geo