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"Why are you using a 17.74 Np Lb?"I do that because the middle peak is much easier to identify for me .I start with an Fe-55 source, which gives a usable peak in 3 or 4 seconds @5.9 keV, this also

I need to let it run longer but right now it looks like the 59.5 peak is at 3486 instead of the 3494 indicated in Geo's calibration. The would account for the confusion at the top end over HfKa1=55.79

You’ll need a really long run to pull anything out me thinks. Attached is the actual AM241 Okaklef.mca file spectra blown up and what could hardly be called peaks in ROI’s There is no Ta or Hf

when you can Charles, turn your Am button towards the Si-PIN and take a scan, then post the MCA,. We can check calibration that way. It only takes a few minutes, until the 59.5 shows a peak. Geo

Dud, Here is the .mca. I'll also do a longer run to get at least twice the counts. Regarding Ecal, Theremino is not doing that. The Ecal was done by Geo and I am using the two points that he provided:

Geo, Charles is right here. Stretching the energy cal to fit is going to create big problems, Use a proper 3 pt or better Ecal and verify it. You should never normalize the peak heights (or anything

Charles , The spectra needs a lot more count time before one can say much about what’s in it. Please don’t overlay spectra it makes it hard to interpret, complicates everything and you can’t see

Actually, the "polycrase" I sent you I have subsequently relabeled as uranpyrochlore based on your CdTe scan. https://www.mindat.org/photo-876282.html charlesdavidyoung@...> wrote:

The polycrase should have Ta.

Good on all Charles. Right now the CdTe is online and I'm looking for Ta peaks by internal excitation........Geo

George, Theremino actually has height equalizers for specific regions. I am not sure it is worth fooling with though. Just knowing that Si-PIN rolls off as the energy goes up is enough for me. I am

Nice work Charles. That rock has a lot of visible features that remind me of the one I had that we were calling Columbite for lack of a better name at the time. What is the black material, and is it

I bought a couple of nice microlites from Tony Albini a while back. One was actually identified as xenotime but my NaI scan showed a strong Ta presence so I proposed that it was actually microlite and

Those peaks are very small and not well shaped. They come from leakage and backscatter from the elements that make up the exciter head. I made it from brass (copper and zinc peaks), there is iron and

Why is the ROI 6.05 to 6.45? it should bracket the Fe Ka. I’d watch the temp and see if that drifts which could introduce noise. Dud. Sent: Saturday, January 11, 2020 8:03 AM To: [email protected]

Will do longer soon Dud. The peak search shows FWHM @ Iron Ka as 0.145 = 145 eV Right on specs for this sensor. I got it cheap because it was new, warranty return complaint was "Not stable and FWHM @

Run a longer count to smooth it up a bit. Sent: Friday, January 10, 2020 6:57 PM To: [email protected] Subject: Re: [XRF] Silicon XRF Will see if it tells me FWHM tomorrow Dud. Geo

Will see if it tells me FWHM tomorrow Dud. Geo

Nice. What’s the FWHM? Dud Sent: Friday, January 10, 2020 5:25 PM To: [email protected] Subject: [XRF] Silicon XRF A nice peak from pure silicon, the sample is 1 3/4" diameter slice of pure silicon,

Sorry no Si-PIN here until new power supply is installed.............Grrrrrrr..........