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Attached is an example of how radionuclides can be distributed within a mineral specimen, showing the variability of the depth of these included sources. There is an excellent picture of my knee on

Thanks for that Steve, I didn't realize about the varying U/Th ratios, that makes sense.Until Charles started mentioning then showing the self-excited aspect it never occurred to me to XRF radioactive

Geo, great explanation but it gets even crazier than that. Different mineral districts have different U/Th ratios, and they are different ages. So you have an unknown ratio of these elements and their

Hi Charles, cool observation. If I may guess at it:We know from experience that an atom will make XRF if excited by energy from alpha, beta (or electron stream) Gamma, X-Rays etc. Probably many other

"although I don’t recall that he quantified percentages of each of the metals in the mix."Ken I don't have the program to do that. It is very costly. All I can do is (to try to) identify

I think you are comparing two different files. One is Allanite the other is Melanocerite, one from Canada one from Norway. Send single spectra plots no overlays. Dud Sent: Friday, February 7, 2020

Hi Dud, Thanks for the very detailed analysis of the mystery wire. I see in the description that you call it ‘insulated wire’. Was the insulation still on the wire when you ran the analysis, or

I recently picked up a specimen of melanocerite-Ce at the mineral show and did a scan without Am241 by depending on the internal radiation. I was not surprised to see Th La Ce and Nd in the blue

Thanks for that Dudley, when I get my own SDD going I can compare- it may be a while tho.Geo

Ken, Attached are the results of your Mystery Wire. The data were taken with an Olympus DP4050 pXRF. As I don't have an ALLOY calibration for this gun I used the Mining Mode to get the percentage

Sounds good. These two big side holes are from the two inch PMT units. I also have the thick shield tubes from them. It's heavy like lead but adds you can see looks like copper/bronze, probably a

"I think the shield from a liquid scint counter I parted out will work for this with some work. "No doubt, we did learn the lining (passivation layer) is nearly as important as the safety

Cool. I think the shield from a liquid scint counter I parted out will work for this with some work. While I can foresee moving to a more modern (no LN2 needed) detector than the HPGe, I did buy the

Looks good let’s see some data Dud Sent: Thursday, February 6, 2020 11:56 AM To: [email protected] Subject: Re: [XRF] 2020 Portable X-Ray Tube XRF Outfit.Sensor Port Upgrades The inner aluminum

The inner aluminum layer is held in place inside the lead layer by a threaded pipe. The length of that pipe limits the insertion depth when that hole is used for the sensor port: New machined

Aluminum scrap from the shop, for some unknown past project: Top view The thickness is fine, works as expected to eliminate unwanted XRF, but the diameter is way to large. Initial testing shows

Nice tight beam good for crystal work Dud Sent: Wednesday, February 5, 2020 6:59 PM To: [email protected] Subject: Re: [XRF] Stainless Steel XRF Dud, I'll look at the link tomorrow, thanks.

Dud, I'll look at the link tomorrow, thanks. Meantime, per your request,? my? module gives a 10mm round beam at the surface of the brass port that is part of the module.2.25 inches away the spot it

Geo, You use XRF filters to remove tube artifacts, Brem, and fine tune low energy response. The filters are used in conjunction with the tube voltage and the filter material is tailored for the

" Geo,Why is there 4.8mm of Al attenuator in the beam path? "Two reasons, the first is to selectively block the lowest energies from the tube (to help the detector see less noise at the area of