Re: Trinitite
What is interesting is the ratio of intensity of 235/238. Of course, nuclide production, decay activity and contribution of Unat must be considered but it still seems off. Steve
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WILLIAM S Dubyk
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#1246
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Re: Trinitite
He did weigh the sample Steve, but then he digested it in Hydrofluoric and Nitric acid. after drying he must have measured it again? Anyhow I don't know but would guess yes they can do that.
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GEOelectronics@...
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#1245
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Re: Trinitite
Is there any way to convert intensity to ppm or ppt? Steve ________________________________ Sent: Tuesday, September 29, 2020 4:05 PM To: [email protected] <[email protected]> Subject: Re: [XRF] Trinitite
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WILLIAM S Dubyk
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#1244
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Re: Si pin xrf ..1st go
Possibly a mix up. I did a fresh scan cos I din save the previous mca file I thought I picked up the same one I do have many apron samples
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taray singh <sukhjez@...>
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#1243
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Re: Trinitite
"Neptunium", a YouTuber did an ICPMS mass-spectrum? of Trinitite. From the data presented on isotope ratios these are of most interest to us: Analysis? ? ?Intensity U-235? ? ? ? ? ?1523.1
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GEOelectronics@...
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#1242
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Re: Trinitite
Geo, I think you¡¯ve gone as far as you can without calculating a Pu concentration from the Am and determining the x-ray yields. The Pu derived U x-ray peaks of La1, Lb1, Lg1 and Ll you see in the
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Dude
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#1241
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Trinitite Analysis: Uranium Decay Schemes
*U-238* Let's walk through Uranium Radioactive Decay Schemes, one U isotope at a time to clarify the reason we see certain peaks on spectroscopy scans. We use the convention in this science that:
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GEOelectronics@...
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#1240
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Re: Si pin xrf ..1st go
Taray, Is this a different apron? The accumulation times and dates are different and the spectra look different Sent: Tuesday, September 29, 2020 4:22 AM To: [email protected] Subject: Re: [XRF] Si pin
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Dude
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#1239
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Re: Trinitite
A closer look at a Gamma RaySpectrum scan of Red Trinitite? (see pics in first post of this thread). The picture and .mca attached are of a previous (19FED2020) scan of Red Trinitite In the photo you
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GEOelectronics@...
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#1238
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Re: Si pin xrf ..1st go
Here is the x ray apron file. Taray
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taray singh <sukhjez@...>
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#1236
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Re: Si pin xrf ..1st go
Guys Thanks for the tips Geo and I had a running commentary setup Next time mca files will follow Yep Rubbery feet is blocking heat loss Just din strike me.. I have a rounded block of metal which I
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taray singh <sukhjez@...>
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#1235
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Re: Si pin xrf ..1st go
Geo, It looked like a 1024 conversion gain. Most Si detectors will use 2048 even at the expense of counting time. Count time, FWHM, and noise can be traded off using peaking time¡its always
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Dude
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#1234
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Re: Si pin xrf ..1st go
Good to know that Thanks Dud.Some mass spectrometer test of Trinitite et. al results are out there on the internet, will gather a few and see if they are showing parent, decay and fission products
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GEOelectronics@...
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#1233
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Re: Si pin xrf ..1st go
LOD depends on the element but in general the XRF limit of detection at best is 0.5 ppm and above, so for a ppb range element you¡¯ll need to do ICP/MS. That can also get stable element isotopic
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Dude
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#1232
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Re: Trinitite
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GEOelectronics@...
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#1231
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Re: Trinitite
I loaded the ZIP file to the c: documents/raddecay folder and extracted it there. Then did a shortcut of the exe file to the desktop. You should be able to select where to install when you extract it.
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Dude
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#1230
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Re: Si pin xrf ..1st go
Dud, with the XRF gun, what is the likelihood of detecting a unique element in a large Trinitite sample, when the element dispersed and total weight is 1x10e-9 grams? Say the sample was 28 grams. Geo
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GEOelectronics@...
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#1229
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Re: Si pin xrf ..1st go
The same scale expansion can be done selecting the Select View box on the tool bar. The cursor changes to a + and by holding the left mouse button you can select the range to expand. Click the < >
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Dude
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#1228
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Re: Si pin xrf ..1st go
Dude, I did the energy cal here when I built it. Used test sources. Geo To: [email protected] Sent: Monday, September 28, 2020 12:42:20 PM Subject: Re: [XRF] Si pin xrf ..1st go Nice clean spectra,
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GEOelectronics@...
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#1227
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Re: Si pin xrf ..1st go
Nice clean spectra, lookin¡¯ good. You can take the conversion gain up to 2048 channels which will get a bit more resolution at the expense of a longer count time. If you are talking about a peak
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Dude
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#1226
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